{"id":419,"date":"2026-09-18T08:27:03","date_gmt":"2026-09-18T08:27:03","guid":{"rendered":"https:\/\/vipulhvacsolution.in\/blog\/?p=419"},"modified":"2026-09-18T08:33:58","modified_gmt":"2026-09-18T08:33:58","slug":"can-fcu-work-without-ahu","status":"publish","type":"post","link":"https:\/\/vipulhvacsolution.in\/blog\/can-fcu-work-without-ahu\/","title":{"rendered":"Can FCU Work Without AHU?"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_88 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/vipulhvacsolution.in\/blog\/can-fcu-work-without-ahu\/#Can_FCU_Work_Without_AHU_Complete_HVAC_Guide\" >Can FCU Work Without AHU? Complete HVAC Guide<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/vipulhvacsolution.in\/blog\/can-fcu-work-without-ahu\/#What_Is_an_FCU\" >What Is an FCU?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/vipulhvacsolution.in\/blog\/can-fcu-work-without-ahu\/#What_Is_an_AHU\" >What Is an AHU?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/vipulhvacsolution.in\/blog\/can-fcu-work-without-ahu\/#Can_FCU_Work_Without_AHU\" >Can FCU Work Without AHU?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/vipulhvacsolution.in\/blog\/can-fcu-work-without-ahu\/#But_There_Is_an_Important_Catch\" >But There Is an Important Catch<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/vipulhvacsolution.in\/blog\/can-fcu-work-without-ahu\/#How_Does_an_FCU_Work_Without_an_AHU\" >How Does an FCU Work Without an AHU?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/vipulhvacsolution.in\/blog\/can-fcu-work-without-ahu\/#Does_an_FCU_Need_a_Chiller\" >Does an FCU Need a Chiller?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/vipulhvacsolution.in\/blog\/can-fcu-work-without-ahu\/#Can_FCU_Work_With_a_Chiller_but_Without_AHU\" >Can FCU Work With a Chiller but Without AHU?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/vipulhvacsolution.in\/blog\/can-fcu-work-without-ahu\/#FCU_Without_AHU_vs_FCU_With_AHU\" >FCU Without AHU vs FCU With AHU<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/vipulhvacsolution.in\/blog\/can-fcu-work-without-ahu\/#Why_Would_You_Use_an_FCU_Without_an_AHU\" >Why Would You Use an FCU Without an AHU?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/vipulhvacsolution.in\/blog\/can-fcu-work-without-ahu\/#FCU_AHU_System_for_a_Hotel\" >FCU + AHU System for a Hotel<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/vipulhvacsolution.in\/blog\/can-fcu-work-without-ahu\/#FCU_AHU_System_for_an_Office\" >FCU + AHU System for an Office<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/vipulhvacsolution.in\/blog\/can-fcu-work-without-ahu\/#FCU_Without_AHU_What_About_Fresh_Air\" >FCU Without AHU: What About Fresh Air?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/vipulhvacsolution.in\/blog\/can-fcu-work-without-ahu\/#Can_an_FCU_Provide_Fresh_Air\" >Can an FCU Provide Fresh Air?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/vipulhvacsolution.in\/blog\/can-fcu-work-without-ahu\/#FCU_vs_AHU_Key_Difference\" >FCU vs AHU: Key Difference<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/vipulhvacsolution.in\/blog\/can-fcu-work-without-ahu\/#Which_Is_Better_FCU_or_AHU\" >Which Is Better: FCU or AHU?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/vipulhvacsolution.in\/blog\/can-fcu-work-without-ahu\/#Can_FCU_Work_Without_Chilled_Water\" >Can FCU Work Without Chilled Water?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/vipulhvacsolution.in\/blog\/can-fcu-work-without-ahu\/#Can_FCU_Work_Without_a_Chiller\" >Can FCU Work Without a Chiller?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/vipulhvacsolution.in\/blog\/can-fcu-work-without-ahu\/#What_Is_the_Difference_Between_FCU_and_Split_AC\" >What Is the Difference Between FCU and Split AC?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/vipulhvacsolution.in\/blog\/can-fcu-work-without-ahu\/#What_Is_the_Difference_Between_FCU_and_VRF\" >What Is the Difference Between FCU and VRF?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/vipulhvacsolution.in\/blog\/can-fcu-work-without-ahu\/#Example_Small_Hotel\" >Example: Small Hotel<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/vipulhvacsolution.in\/blog\/can-fcu-work-without-ahu\/#Example_Large_Shopping_Mall\" >Example: Large Shopping Mall<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/vipulhvacsolution.in\/blog\/can-fcu-work-without-ahu\/#Example_Hospital\" >Example: Hospital<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/vipulhvacsolution.in\/blog\/can-fcu-work-without-ahu\/#7_Things_to_Check_Before_Installing_an_FCU_Without_AHU\" >7 Things to Check Before Installing an FCU Without AHU<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/vipulhvacsolution.in\/blog\/can-fcu-work-without-ahu\/#VIPUL_HVAC_FCU_Solutions\" >VIPUL HVAC FCU Solutions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/vipulhvacsolution.in\/blog\/can-fcu-work-without-ahu\/#Why_Choose_VIPUL_HVAC\" >Why Choose VIPUL HVAC?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/vipulhvacsolution.in\/blog\/can-fcu-work-without-ahu\/#Frequently_Asked_Questions\" >Frequently Asked Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/vipulhvacsolution.in\/blog\/can-fcu-work-without-ahu\/#Final_Answer_Can_FCU_Work_Without_AHU\" >Final Answer: Can FCU Work Without AHU?<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"PDq2pG_selectionAnchorContainer\" dir=\"auto\" data-section-id=\"1of5st7\" data-start=\"0\" data-end=\"47\"><span class=\"ez-toc-section\" id=\"Can_FCU_Work_Without_AHU_Complete_HVAC_Guide\"><\/span>Can FCU Work Without AHU? Complete HVAC Guide<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"49\" data-end=\"269\"><strong data-start=\"49\" data-end=\"125\">Yes, an FCU (Fan Coil Unit) can work without an AHU (Air Handling Unit).<\/strong> An FCU is a separate HVAC terminal that can condition air for an individual room or zone. It does <strong data-start=\"224\" data-end=\"257\">not inherently require an AHU<\/strong> to operate.<\/p>\n<p dir=\"auto\" data-start=\"271\" data-end=\"314\"><strong>However, there is an important distinction:<\/strong><\/p>\n<blockquote data-start=\"316\" data-end=\"480\">\n<p dir=\"auto\" data-start=\"318\" data-end=\"480\"><strong data-start=\"318\" data-end=\"480\">An FCU can operate without an AHU, but a chilled-water FCU still needs a source of chilled water\u2014typically a chiller or another suitable cooling-water system.<\/strong><\/p>\n<\/blockquote>\n<p dir=\"auto\" data-start=\"482\" data-end=\"763\">An FCU primarily handles local temperature control, while an <a href=\"https:\/\/vipulac.in\/air-handling-unit\/\" target=\"_blank\" rel=\"noopener\">AHU<\/a> is generally designed for larger airflow volumes, air treatment and distribution. ASHRAE notes that fan-coil units can operate independently of a central air-distribution system.<\/p>\n<p dir=\"auto\" data-start=\"765\" data-end=\"941\">For many commercial buildings, an <strong data-start=\"799\" data-end=\"846\">FCU + separate fresh-air\/ventilation system<\/strong> can be a practical solution. In other projects, an <strong data-start=\"898\" data-end=\"916\">AHU + ductwork<\/strong> may be more appropriate.<\/p>\n<hr data-start=\"1790\" data-end=\"1793\" \/>\n<h2 dir=\"auto\" data-section-id=\"1vr1lti\" data-start=\"1795\" data-end=\"1812\"><span class=\"ez-toc-section\" id=\"What_Is_an_FCU\"><\/span>What Is an FCU?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"1814\" data-end=\"1847\"><strong data-start=\"1814\" data-end=\"1847\">FCU stands for Fan Coil Unit.<\/strong><\/p>\n<p dir=\"auto\" data-start=\"1849\" data-end=\"1959\">An FCU is a relatively compact HVAC terminal containing a fan and coil that conditions air for a room or zone.<\/p>\n<p dir=\"auto\" data-start=\"1961\" data-end=\"2005\"><strong>Depending on the system, an FCU can provide:<\/strong><\/p>\n<ul data-start=\"2007\" data-end=\"2122\">\n<li data-section-id=\"5zkjd3\" data-start=\"2007\" data-end=\"2016\">Cooling<\/li>\n<li data-section-id=\"lbrbww\" data-start=\"2017\" data-end=\"2026\">Heating<\/li>\n<li data-section-id=\"9pmrsd\" data-start=\"2027\" data-end=\"2044\">Air circulation<\/li>\n<li data-section-id=\"5xds8a\" data-start=\"2045\" data-end=\"2063\">Basic filtration<\/li>\n<li data-section-id=\"zqiiz2\" data-start=\"2064\" data-end=\"2091\">Local temperature control<\/li>\n<li data-section-id=\"1hlc49e\" data-start=\"2092\" data-end=\"2122\">Air movement within the room<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"2124\" data-end=\"2389\">ASHRAE describes fan-coil units as factory-made assemblies that can provide temperature\/humidity control, filtration and room air distribution, and notes that they can operate independently of a central air-distribution system.<\/p>\n<p dir=\"auto\" data-start=\"2391\" data-end=\"2596\">VIPUL HVAC currently offers FCUs with <strong data-start=\"2429\" data-end=\"2456\">0.5 TR to 5 TR capacity<\/strong>, chilled-water cooling, multi-speed airflow, thermostat\/BMS-ready controls and condensate management.<\/p>\n<hr data-start=\"2598\" data-end=\"2601\" \/>\n<h2 dir=\"auto\" data-section-id=\"1vqyzyy\" data-start=\"2603\" data-end=\"2620\"><span class=\"ez-toc-section\" id=\"What_Is_an_AHU\"><\/span>What Is an AHU?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"2622\" data-end=\"2659\"><strong data-start=\"2622\" data-end=\"2659\">AHU stands for Air Handling Unit.<\/strong><\/p>\n<p dir=\"auto\" data-start=\"2661\" data-end=\"2794\">An AHU is generally a larger HVAC air-treatment and distribution unit designed to handle and condition air for one or multiple zones.<\/p>\n<p dir=\"auto\" data-start=\"2796\" data-end=\"2845\"><strong>Depending on the application, an AHU may include:<\/strong><\/p>\n<ul data-start=\"2847\" data-end=\"3051\">\n<li data-section-id=\"3zj3ma\" data-start=\"2847\" data-end=\"2859\">Supply fan<\/li>\n<li data-section-id=\"1umz6mm\" data-start=\"2860\" data-end=\"2874\">Cooling coil<\/li>\n<li data-section-id=\"rnjp2x\" data-start=\"2875\" data-end=\"2889\">Heating coil<\/li>\n<li data-section-id=\"1a6or5u\" data-start=\"2890\" data-end=\"2902\">Pre-filter<\/li>\n<li data-section-id=\"1xemhsc\" data-start=\"2903\" data-end=\"2916\">Fine filter<\/li>\n<li data-section-id=\"9th4tw\" data-start=\"2917\" data-end=\"2930\">HEPA filter<\/li>\n<li data-section-id=\"1fe9bbw\" data-start=\"2931\" data-end=\"2950\">Fresh-air section<\/li>\n<li data-section-id=\"l1qy70\" data-start=\"2951\" data-end=\"2971\">Return-air section<\/li>\n<li data-section-id=\"1pppl04\" data-start=\"2972\" data-end=\"2981\">Dampers<\/li>\n<li data-section-id=\"ggfau\" data-start=\"2982\" data-end=\"3000\">Humidity control<\/li>\n<li data-section-id=\"kt4sw0\" data-start=\"3001\" data-end=\"3015\">BMS controls<\/li>\n<li data-section-id=\"a29n5g\" data-start=\"3016\" data-end=\"3051\">Air distribution through ductwork<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"3053\" data-end=\"3291\">VIPUL&#8217;s current AHU offering includes customized CFM capacity, single- and double-skin construction, pre\/fine\/HEPA filtration, cooling\/heating coils, backward-curved or EC fans and BMS-ready controls.<\/p>\n<hr data-start=\"3293\" data-end=\"3296\" \/>\n<h2 dir=\"auto\" data-section-id=\"vaio50\" data-start=\"3298\" data-end=\"3325\"><span class=\"ez-toc-section\" id=\"Can_FCU_Work_Without_AHU\"><\/span>Can FCU Work Without AHU?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 dir=\"auto\" data-section-id=\"1xwjoqs\" data-start=\"3327\" data-end=\"3334\">Yes.<\/h3>\n<p dir=\"auto\" data-start=\"3336\" data-end=\"3398\">An FCU does <strong data-start=\"3348\" data-end=\"3397\">not need an AHU simply to cool or heat a room<\/strong>.<\/p>\n<p dir=\"auto\" data-start=\"3400\" data-end=\"3460\"><strong>For example, a typical chilled-water FCU arrangement can be:<\/strong><\/p>\n<p dir=\"auto\" data-start=\"3462\" data-end=\"3473\"><strong data-start=\"3462\" data-end=\"3473\">Chiller<\/strong><\/p>\n<p dir=\"auto\" data-start=\"3475\" data-end=\"3476\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"3478\" data-end=\"3500\"><strong data-start=\"3478\" data-end=\"3500\">Chilled-Water Pump<\/strong><\/p>\n<p dir=\"auto\" data-start=\"3502\" data-end=\"3503\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"3505\" data-end=\"3529\"><strong data-start=\"3505\" data-end=\"3529\">Chilled-Water Piping<\/strong><\/p>\n<p dir=\"auto\" data-start=\"3531\" data-end=\"3532\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"3534\" data-end=\"3541\"><strong data-start=\"3534\" data-end=\"3541\">FCU<\/strong><\/p>\n<p dir=\"auto\" data-start=\"3543\" data-end=\"3544\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"3546\" data-end=\"3566\"><strong data-start=\"3546\" data-end=\"3566\">Conditioned Room<\/strong><\/p>\n<p dir=\"auto\" data-start=\"3568\" data-end=\"3569\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"3571\" data-end=\"3595\"><strong data-start=\"3571\" data-end=\"3595\">Return Chilled Water<\/strong><\/p>\n<p dir=\"auto\" data-start=\"3597\" data-end=\"3598\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"3600\" data-end=\"3611\"><strong data-start=\"3600\" data-end=\"3611\">Chiller<\/strong><\/p>\n<p dir=\"auto\" data-start=\"3613\" data-end=\"3656\">In this configuration, there is <strong data-start=\"3645\" data-end=\"3655\">no AHU<\/strong>.<\/p>\n<p dir=\"auto\" data-start=\"3658\" data-end=\"3780\">The FCU receives chilled water, circulates room air across its cooling coil and returns conditioned air to the same space.<\/p>\n<p dir=\"auto\" data-start=\"3782\" data-end=\"3922\">VIPUL&#8217;s chiller information similarly describes chilled water being distributed to both AHUs and FCUs.<\/p>\n<hr data-start=\"3924\" data-end=\"3927\" \/>\n<h2 dir=\"auto\" data-section-id=\"ru5n0l\" data-start=\"3929\" data-end=\"3962\"><span class=\"ez-toc-section\" id=\"But_There_Is_an_Important_Catch\"><\/span>But There Is an Important Catch<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"3964\" data-end=\"4028\">The answer becomes different when we talk about <strong data-start=\"4012\" data-end=\"4027\">ventilation<\/strong>.<\/p>\n<p dir=\"auto\" data-start=\"4030\" data-end=\"4168\">An FCU can provide local cooling, but that does not automatically mean it provides all the outdoor ventilation air required by a building.<\/p>\n<p dir=\"auto\" data-start=\"4170\" data-end=\"4510\">ASHRAE notes that fan-coil systems may operate independently, but outdoor-air\/ventilation requirements need to be properly addressed; in commercial buildings, outdoor air supplied directly through uncontrolled wall openings is not an appropriate substitute for a properly controlled ventilation system.<\/p>\n<p dir=\"auto\" data-start=\"4512\" data-end=\"4522\"><strong>Therefore:<\/strong><\/p>\n<h3 dir=\"auto\" data-section-id=\"rui8p2\" data-start=\"4524\" data-end=\"4543\">FCU without AHU<\/h3>\n<p dir=\"auto\" data-start=\"4545\" data-end=\"4582\"><strong data-start=\"4545\" data-end=\"4582\">Possible for temperature control.<\/strong><\/p>\n<h3 dir=\"auto\" data-section-id=\"9scmsm\" data-start=\"4584\" data-end=\"4624\">FCU without any ventilation strategy<\/h3>\n<p dir=\"auto\" data-start=\"4626\" data-end=\"4740\"><strong data-start=\"4626\" data-end=\"4652\">May not be appropriate<\/strong>, particularly in occupied commercial spaces where outdoor-air requirements must be met.<\/p>\n<p dir=\"auto\" data-start=\"4742\" data-end=\"4782\">This distinction is extremely important.<\/p>\n<hr data-start=\"4784\" data-end=\"4787\" \/>\n<h2 dir=\"auto\" data-section-id=\"kwu8dx\" data-start=\"4789\" data-end=\"4827\"><span class=\"ez-toc-section\" id=\"How_Does_an_FCU_Work_Without_an_AHU\"><\/span>How Does an FCU Work Without an AHU?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"4829\" data-end=\"4851\">Consider a hotel room.<\/p>\n<p dir=\"auto\" data-start=\"4853\" data-end=\"4878\"><strong>The system may look like:<\/strong><\/p>\n<p dir=\"auto\" data-start=\"4880\" data-end=\"4899\"><strong data-start=\"4880\" data-end=\"4899\">Central Chiller<\/strong><\/p>\n<p dir=\"auto\" data-start=\"4901\" data-end=\"4902\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"4904\" data-end=\"4926\"><strong data-start=\"4904\" data-end=\"4926\">Chilled-Water Pipe<\/strong><\/p>\n<p dir=\"auto\" data-start=\"4928\" data-end=\"4929\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"4931\" data-end=\"4949\"><strong data-start=\"4931\" data-end=\"4949\">Hotel Room FCU<\/strong><\/p>\n<p dir=\"auto\" data-start=\"4951\" data-end=\"4952\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"4954\" data-end=\"4966\"><strong data-start=\"4954\" data-end=\"4966\">Room Air<\/strong><\/p>\n<p dir=\"auto\" data-start=\"4968\" data-end=\"4985\"><strong>The FCU contains:<\/strong><\/p>\n<h3 dir=\"auto\" data-section-id=\"866l4g\" data-start=\"4987\" data-end=\"4997\">1. Fan<\/h3>\n<p dir=\"auto\" data-start=\"4999\" data-end=\"5039\">The fan pulls room air through the unit.<\/p>\n<h3 dir=\"auto\" data-section-id=\"meolfg\" data-start=\"5041\" data-end=\"5060\">2. Cooling Coil<\/h3>\n<p dir=\"auto\" data-start=\"5062\" data-end=\"5099\">Chilled water flows through the coil.<\/p>\n<h3 dir=\"auto\" data-section-id=\"1v9elkr\" data-start=\"5101\" data-end=\"5114\">3. Filter<\/h3>\n<p dir=\"auto\" data-start=\"5116\" data-end=\"5181\">The filter removes some airborne particles from recirculated air.<\/p>\n<h3 dir=\"auto\" data-section-id=\"k5mlqf\" data-start=\"5183\" data-end=\"5200\">4. Thermostat<\/h3>\n<p dir=\"auto\" data-start=\"5202\" data-end=\"5268\">The thermostat controls the room temperature and\/or FCU operation.<\/p>\n<h3 dir=\"auto\" data-section-id=\"1am1m77\" data-start=\"5270\" data-end=\"5293\">5. Condensate Drain<\/h3>\n<p dir=\"auto\" data-start=\"5295\" data-end=\"5357\">Condensation produced during cooling is collected and drained.<\/p>\n<p dir=\"auto\" data-start=\"5359\" data-end=\"5409\">The FCU therefore conditions the room air locally.<\/p>\n<hr data-start=\"5411\" data-end=\"5414\" \/>\n<h2 dir=\"auto\" data-section-id=\"1fihlxh\" data-start=\"5416\" data-end=\"5445\"><span class=\"ez-toc-section\" id=\"Does_an_FCU_Need_a_Chiller\"><\/span>Does an FCU Need a Chiller?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"5447\" data-end=\"5516\">For a <strong data-start=\"5453\" data-end=\"5474\">chilled-water FCU<\/strong>, yes, it needs a source of chilled water.<\/p>\n<p dir=\"auto\" data-start=\"5518\" data-end=\"5542\"><strong>That source is commonly:<\/strong><\/p>\n<ul data-start=\"5544\" data-end=\"5661\">\n<li data-section-id=\"odyyck\" data-start=\"5544\" data-end=\"5564\">Air-cooled chiller<\/li>\n<li data-section-id=\"1fvg20b\" data-start=\"5565\" data-end=\"5587\">Water-cooled chiller<\/li>\n<li data-section-id=\"1fdel9h\" data-start=\"5588\" data-end=\"5618\">Suitable chilled-water plant<\/li>\n<li data-section-id=\"1oto0yc\" data-start=\"5619\" data-end=\"5661\">Other compatible hydronic cooling source<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"5663\" data-end=\"5686\"><strong>A simplified system is:<\/strong><\/p>\n<p dir=\"auto\" data-start=\"5688\" data-end=\"5742\"><strong data-start=\"5688\" data-end=\"5742\">Chiller \u2192 Pump \u2192 Chilled-Water Piping \u2192 FCU \u2192 Room<\/strong><\/p>\n<p dir=\"auto\" data-start=\"5744\" data-end=\"5767\"><strong>The important point is:<\/strong><\/p>\n<blockquote data-start=\"5769\" data-end=\"5851\">\n<p dir=\"auto\" data-start=\"5771\" data-end=\"5851\"><strong data-start=\"5771\" data-end=\"5851\">FCU does not require an AHU, but a chilled-water FCU requires chilled water.<\/strong><\/p>\n<\/blockquote>\n<p dir=\"auto\" data-start=\"5853\" data-end=\"5974\">VIPUL&#8217;s current FCU product page specifies <strong data-start=\"5896\" data-end=\"5935\">chilled water as the cooling medium<\/strong>.<\/p>\n<hr data-start=\"5976\" data-end=\"5979\" \/>\n<h2 dir=\"auto\" data-section-id=\"1ikuue9\" data-start=\"5981\" data-end=\"6027\"><span class=\"ez-toc-section\" id=\"Can_FCU_Work_With_a_Chiller_but_Without_AHU\"><\/span>Can FCU Work With a Chiller but Without AHU?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 dir=\"auto\" data-section-id=\"1xwjoqs\" data-start=\"6029\" data-end=\"6036\">Yes.<\/h3>\n<p dir=\"auto\" data-start=\"6038\" data-end=\"6103\">This is one of the most common ways to understand the difference.<\/p>\n<p dir=\"auto\" data-start=\"6105\" data-end=\"6117\"><strong>For example:<\/strong><\/p>\n<p dir=\"auto\" data-start=\"6119\" data-end=\"6130\"><strong data-start=\"6119\" data-end=\"6130\">Chiller<\/strong><\/p>\n<p dir=\"auto\" data-start=\"6132\" data-end=\"6133\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"6135\" data-end=\"6143\"><strong data-start=\"6135\" data-end=\"6143\">Pump<\/strong><\/p>\n<p dir=\"auto\" data-start=\"6145\" data-end=\"6146\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"6148\" data-end=\"6178\"><strong data-start=\"6148\" data-end=\"6178\">Chilled-Water Distribution<\/strong><\/p>\n<p dir=\"auto\" data-start=\"6180\" data-end=\"6181\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"6183\" data-end=\"6211\"><strong data-start=\"6183\" data-end=\"6211\">FCUs in Individual Rooms<\/strong><\/p>\n<p dir=\"auto\" data-start=\"6213\" data-end=\"6214\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"6216\" data-end=\"6232\"><strong data-start=\"6216\" data-end=\"6232\">Room Cooling<\/strong><\/p>\n<p dir=\"auto\" data-start=\"6234\" data-end=\"6282\">There may be no central AHU serving those rooms.<\/p>\n<p dir=\"auto\" data-start=\"6284\" data-end=\"6374\">This arrangement can be useful when individual zones need independent temperature control.<\/p>\n<p dir=\"auto\" data-start=\"6376\" data-end=\"6569\">ASHRAE identifies fan-coils as suitable for individual-zone applications and notes that they can operate independently of central air-distribution systems.<\/p>\n<hr data-start=\"6571\" data-end=\"6574\" \/>\n<h2 dir=\"auto\" data-section-id=\"wjg5ql\" data-start=\"6576\" data-end=\"6609\"><span class=\"ez-toc-section\" id=\"FCU_Without_AHU_vs_FCU_With_AHU\"><\/span>FCU Without AHU vs FCU With AHU<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div class=\"group TyagGW_tableContainer\" dir=\"auto\">\n<div class=\"TyagGW_tableWrapper flex flex-col-reverse w-fit\" tabindex=\"-1\">\n<table class=\"w-fit min-w-(--thread-content-width)\" dir=\"auto\" style=\"height: 429px;\" width=\"738\" data-start=\"6611\" data-end=\"7344\">\n<thead data-start=\"6611\" data-end=\"6652\">\n<tr data-start=\"6611\" data-end=\"6652\">\n<th class=\"last:pe-10\" data-start=\"6611\" data-end=\"6621\" data-col-size=\"sm\">Feature<\/th>\n<th class=\"last:pe-10\" data-start=\"6621\" data-end=\"6639\" data-col-size=\"sm\">FCU Without AHU<\/th>\n<th class=\"last:pe-10\" data-start=\"6639\" data-end=\"6652\" data-col-size=\"sm\">FCU + AHU<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"6667\" data-end=\"7344\">\n<tr data-start=\"6667\" data-end=\"6696\">\n<td data-start=\"6667\" data-end=\"6683\" data-col-size=\"sm\">Local cooling<\/td>\n<td data-start=\"6683\" data-end=\"6689\" data-col-size=\"sm\">Yes<\/td>\n<td data-start=\"6689\" data-end=\"6696\" data-col-size=\"sm\">Yes<\/td>\n<\/tr>\n<tr data-start=\"6697\" data-end=\"6748\">\n<td data-start=\"6697\" data-end=\"6723\" data-col-size=\"sm\">Individual zone control<\/td>\n<td data-start=\"6723\" data-end=\"6735\" data-col-size=\"sm\">Excellent<\/td>\n<td data-start=\"6735\" data-end=\"6748\" data-col-size=\"sm\">Excellent<\/td>\n<\/tr>\n<tr data-start=\"6749\" data-end=\"6776\">\n<td data-start=\"6749\" data-end=\"6764\" data-col-size=\"sm\">AHU required<\/td>\n<td data-start=\"6764\" data-end=\"6769\" data-col-size=\"sm\">No<\/td>\n<td data-start=\"6769\" data-end=\"6776\" data-col-size=\"sm\">Yes<\/td>\n<\/tr>\n<tr data-start=\"6777\" data-end=\"6856\">\n<td data-start=\"6777\" data-end=\"6800\" data-col-size=\"sm\">Chilled-water source<\/td>\n<td data-start=\"6800\" data-end=\"6836\" data-col-size=\"sm\">Usually required for hydronic FCU<\/td>\n<td data-col-size=\"sm\" data-start=\"6836\" data-end=\"6856\">Usually required<\/td>\n<\/tr>\n<tr data-start=\"6857\" data-end=\"6935\">\n<td data-start=\"6857\" data-end=\"6880\" data-col-size=\"sm\">Fresh-air management<\/td>\n<td data-start=\"6880\" data-end=\"6914\" data-col-size=\"sm\">Separate system may be required<\/td>\n<td data-start=\"6914\" data-end=\"6935\" data-col-size=\"sm\">AHU can handle it<\/td>\n<\/tr>\n<tr data-start=\"6936\" data-end=\"6981\">\n<td data-start=\"6936\" data-end=\"6947\" data-col-size=\"sm\">Ductwork<\/td>\n<td data-start=\"6947\" data-end=\"6963\" data-col-size=\"sm\">Minimal\/local<\/td>\n<td data-start=\"6963\" data-end=\"6981\" data-col-size=\"sm\">More extensive<\/td>\n<\/tr>\n<tr data-start=\"6982\" data-end=\"7034\">\n<td data-start=\"6982\" data-end=\"7003\" data-col-size=\"sm\">Central filtration<\/td>\n<td data-start=\"7003\" data-end=\"7013\" data-col-size=\"sm\">Limited<\/td>\n<td data-start=\"7013\" data-end=\"7034\" data-col-size=\"sm\">More configurable<\/td>\n<\/tr>\n<tr data-start=\"7035\" data-end=\"7087\">\n<td data-start=\"7035\" data-end=\"7067\" data-col-size=\"sm\">Large-volume air distribution<\/td>\n<td data-start=\"7067\" data-end=\"7077\" data-col-size=\"sm\">Limited<\/td>\n<td data-start=\"7077\" data-end=\"7087\" data-col-size=\"sm\">Strong<\/td>\n<\/tr>\n<tr data-start=\"7088\" data-end=\"7133\">\n<td data-start=\"7088\" data-end=\"7114\" data-col-size=\"sm\">Individual room control<\/td>\n<td data-start=\"7114\" data-end=\"7123\" data-col-size=\"sm\">Strong<\/td>\n<td data-start=\"7123\" data-end=\"7133\" data-col-size=\"sm\">Strong<\/td>\n<\/tr>\n<tr data-start=\"7134\" data-end=\"7181\">\n<td data-start=\"7134\" data-end=\"7148\" data-col-size=\"sm\">Hotel rooms<\/td>\n<td data-start=\"7148\" data-end=\"7169\" data-col-size=\"sm\">Common application<\/td>\n<td data-start=\"7169\" data-end=\"7181\" data-col-size=\"sm\">Possible<\/td>\n<\/tr>\n<tr data-start=\"7182\" data-end=\"7215\">\n<td data-start=\"7182\" data-end=\"7192\" data-col-size=\"sm\">Offices<\/td>\n<td data-start=\"7192\" data-end=\"7203\" data-col-size=\"sm\">Possible<\/td>\n<td data-start=\"7203\" data-end=\"7215\" data-col-size=\"sm\">Possible<\/td>\n<\/tr>\n<tr data-start=\"7216\" data-end=\"7282\">\n<td data-start=\"7216\" data-end=\"7236\" data-col-size=\"sm\">Large open spaces<\/td>\n<td data-col-size=\"sm\" data-start=\"7236\" data-end=\"7256\">Project dependent<\/td>\n<td data-col-size=\"sm\" data-start=\"7256\" data-end=\"7282\">Often more appropriate<\/td>\n<\/tr>\n<tr data-start=\"7283\" data-end=\"7344\">\n<td data-start=\"7283\" data-end=\"7305\" data-col-size=\"sm\">Central ventilation<\/td>\n<td data-start=\"7305\" data-end=\"7323\" data-col-size=\"sm\">Separate system<\/td>\n<td data-start=\"7323\" data-end=\"7344\" data-col-size=\"sm\">Can be integrated<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<hr data-start=\"7346\" data-end=\"7349\" \/>\n<h2 dir=\"auto\" data-section-id=\"esrxga\" data-start=\"7351\" data-end=\"7393\"><span class=\"ez-toc-section\" id=\"Why_Would_You_Use_an_FCU_Without_an_AHU\"><\/span>Why Would You Use an FCU Without an AHU?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"7395\" data-end=\"7421\">There are several reasons.<\/p>\n<h3 dir=\"auto\" data-section-id=\"1rpp8bv\" data-start=\"7423\" data-end=\"7452\">1. Individual Room Control<\/h3>\n<p dir=\"auto\" data-start=\"7454\" data-end=\"7497\">Each FCU can serve a specific room or zone.<\/p>\n<p dir=\"auto\" data-start=\"7499\" data-end=\"7511\"><strong>For example:<\/strong><\/p>\n<ul data-start=\"7513\" data-end=\"7580\">\n<li data-section-id=\"1sdcs2l\" data-start=\"7513\" data-end=\"7529\">Hotel Room 101<\/li>\n<li data-section-id=\"1sdcs2m\" data-start=\"7530\" data-end=\"7546\">Hotel Room 102<\/li>\n<li data-section-id=\"1sdcs2n\" data-start=\"7547\" data-end=\"7563\">Hotel Room 103<\/li>\n<li data-section-id=\"1sdcs2g\" data-start=\"7564\" data-end=\"7580\">Hotel Room 104<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"7582\" data-end=\"7628\">Each room can have its own thermostat\/control.<\/p>\n<hr data-start=\"7630\" data-end=\"7633\" \/>\n<h3 dir=\"auto\" data-section-id=\"gzyyrq\" data-start=\"7635\" data-end=\"7669\">2. Less Air-Duct Infrastructure<\/h3>\n<p dir=\"auto\" data-start=\"7671\" data-end=\"7739\">A traditional centralized AHU system can require extensive ductwork.<\/p>\n<p dir=\"auto\" data-start=\"7741\" data-end=\"7807\">With an FCU, air can be conditioned close to where it is required.<\/p>\n<p dir=\"auto\" data-start=\"7809\" data-end=\"7949\">This can reduce the amount of large central air-distribution ductwork, although chilled-water piping and local ductwork may still be needed.<\/p>\n<p dir=\"auto\" data-start=\"7951\" data-end=\"8195\">ASHRAE notes that fan-coil systems can require less building interstitial space than all-air systems because water\/refrigerant piping can transport energy more compactly than large air-distribution systems.<\/p>\n<hr data-start=\"8197\" data-end=\"8200\" \/>\n<h3 dir=\"auto\" data-section-id=\"9jgsew\" data-start=\"8202\" data-end=\"8226\">3. Suitable for Hotels<\/h3>\n<p dir=\"auto\" data-start=\"8228\" data-end=\"8281\">Hotels are a classic application for room-level FCUs.<\/p>\n<p dir=\"auto\" data-start=\"8283\" data-end=\"8307\"><strong>A typical hotel can use:<\/strong><\/p>\n<p dir=\"auto\" data-start=\"8309\" data-end=\"8320\"><strong data-start=\"8309\" data-end=\"8320\">Chiller<\/strong><\/p>\n<p dir=\"auto\" data-start=\"8322\" data-end=\"8323\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"8325\" data-end=\"8349\"><strong data-start=\"8325\" data-end=\"8349\">Chilled-Water Piping<\/strong><\/p>\n<p dir=\"auto\" data-start=\"8351\" data-end=\"8352\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"8354\" data-end=\"8374\"><strong data-start=\"8354\" data-end=\"8374\">FCU in Each Room<\/strong><\/p>\n<p dir=\"auto\" data-start=\"8376\" data-end=\"8377\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"8379\" data-end=\"8404\"><strong data-start=\"8379\" data-end=\"8404\">Individual Thermostat<\/strong><\/p>\n<p dir=\"auto\" data-start=\"8406\" data-end=\"8454\">This allows individual room temperature control.<\/p>\n<p dir=\"auto\" data-start=\"8456\" data-end=\"8578\">However, the hotel&#8217;s <strong data-start=\"8477\" data-end=\"8577\">fresh-air and ventilation strategy must still be designed separately or integrated appropriately<\/strong>.<\/p>\n<hr data-start=\"8580\" data-end=\"8583\" \/>\n<h3 dir=\"auto\" data-section-id=\"1iw1jnp\" data-start=\"8585\" data-end=\"8610\">4. Suitable for Offices<\/h3>\n<p dir=\"auto\" data-start=\"8612\" data-end=\"8638\"><strong>FCUs can also be used for:<\/strong><\/p>\n<ul data-start=\"8640\" data-end=\"8727\">\n<li data-section-id=\"ovyioh\" data-start=\"8640\" data-end=\"8656\">Private cabins<\/li>\n<li data-section-id=\"1oaba6c\" data-start=\"8657\" data-end=\"8672\">Small offices<\/li>\n<li data-section-id=\"bbisnx\" data-start=\"8673\" data-end=\"8688\">Meeting rooms<\/li>\n<li data-section-id=\"10gx0gc\" data-start=\"8689\" data-end=\"8707\">Individual zones<\/li>\n<li data-section-id=\"125nxgj\" data-start=\"8708\" data-end=\"8727\">Commercial spaces<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"8729\" data-end=\"8931\">For a large open-plan office, however, the HVAC engineer should compare FCU-based zoning with an AHU\/ducted-air solution based on airflow, ventilation, acoustics, ceiling space and control requirements.<\/p>\n<hr data-start=\"8933\" data-end=\"8936\" \/>\n<h3 dir=\"auto\" data-section-id=\"1a9l20h\" data-start=\"8938\" data-end=\"8964\">5. Retrofit Applications<\/h3>\n<p dir=\"auto\" data-start=\"8966\" data-end=\"9060\">FCUs can be useful in some retrofit projects where installing large new ductwork is difficult.<\/p>\n<p dir=\"auto\" data-start=\"9062\" data-end=\"9074\"><strong>For example:<\/strong><\/p>\n<p dir=\"auto\" data-start=\"9076\" data-end=\"9097\"><strong data-start=\"9076\" data-end=\"9097\">Existing Building<\/strong><\/p>\n<p dir=\"auto\" data-start=\"9099\" data-end=\"9100\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"9102\" data-end=\"9130\"><strong data-start=\"9102\" data-end=\"9130\">New Chilled-Water Piping<\/strong><\/p>\n<p dir=\"auto\" data-start=\"9132\" data-end=\"9133\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"9135\" data-end=\"9149\"><strong data-start=\"9135\" data-end=\"9149\">Local FCUs<\/strong><\/p>\n<p dir=\"auto\" data-start=\"9151\" data-end=\"9232\">This can sometimes provide a practical path to adding or modifying cooling zones.<\/p>\n<p dir=\"auto\" data-start=\"9234\" data-end=\"9392\">ASHRAE notes that fan-coil systems can be useful for retrofits and for expanding capacity beyond an existing air system.<\/p>\n<hr data-start=\"9394\" data-end=\"9397\" \/>\n<h3 dir=\"auto\" data-section-id=\"1dvvqct\" data-start=\"9399\" data-end=\"9425\">When Is an AHU Required?<\/h3>\n<p dir=\"auto\" data-start=\"9427\" data-end=\"9543\">An AHU may be appropriate when the project requires centralized treatment and distribution of larger volumes of air.<\/p>\n<p dir=\"auto\" data-start=\"9545\" data-end=\"9575\"><strong>Consider an AHU when you need:<\/strong><\/p>\n<ul data-start=\"9577\" data-end=\"9829\">\n<li data-section-id=\"ta48l9\" data-start=\"9577\" data-end=\"9592\">Large airflow<\/li>\n<li data-section-id=\"1y4ufc8\" data-start=\"9593\" data-end=\"9618\">Centralized ventilation<\/li>\n<li data-section-id=\"193w3h7\" data-start=\"9619\" data-end=\"9641\">Extensive filtration<\/li>\n<li data-section-id=\"1es828h\" data-start=\"9642\" data-end=\"9663\">Fresh-air treatment<\/li>\n<li data-section-id=\"ggfau\" data-start=\"9664\" data-end=\"9682\">Humidity control<\/li>\n<li data-section-id=\"bsftd5\" data-start=\"9683\" data-end=\"9716\">Multiple zones through ductwork<\/li>\n<li data-section-id=\"1qkoobw\" data-start=\"9717\" data-end=\"9734\">HEPA filtration<\/li>\n<li data-section-id=\"1xe78xc\" data-start=\"9735\" data-end=\"9756\">Central BMS control<\/li>\n<li data-section-id=\"18dmeeh\" data-start=\"9757\" data-end=\"9792\">Large commercial air distribution<\/li>\n<li data-section-id=\"1uvtal0\" data-start=\"9793\" data-end=\"9829\">Specialized cleanroom air handling<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"9831\" data-end=\"9843\"><strong>For example:<\/strong><\/p>\n<p dir=\"auto\" data-start=\"9845\" data-end=\"9890\"><strong data-start=\"9845\" data-end=\"9890\">Chiller \u2192 AHU \u2192 Ductwork \u2192 Multiple Rooms<\/strong><\/p>\n<p dir=\"auto\" data-start=\"9892\" data-end=\"9947\">can provide centralized air treatment and distribution.<\/p>\n<hr data-start=\"9949\" data-end=\"9952\" \/>\n<h3 dir=\"auto\" data-section-id=\"11e6uym\" data-start=\"9954\" data-end=\"9985\">FCU and AHU Can Work Together<\/h3>\n<p dir=\"auto\" data-start=\"9987\" data-end=\"10013\"><strong>A common misconception is:<\/strong><\/p>\n<blockquote data-start=\"10015\" data-end=\"10045\">\n<p dir=\"auto\" data-start=\"10017\" data-end=\"10045\">\u201cYou either use FCU or AHU.\u201d<\/p>\n<\/blockquote>\n<p dir=\"auto\" data-start=\"10047\" data-end=\"10063\">Not necessarily.<\/p>\n<p dir=\"auto\" data-start=\"10065\" data-end=\"10093\">A building can use <strong data-start=\"10084\" data-end=\"10092\">both<\/strong>.<\/p>\n<p dir=\"auto\" data-start=\"10095\" data-end=\"10107\"><strong>For example:<\/strong><\/p>\n<h3 dir=\"auto\" data-section-id=\"1674eyh\" data-start=\"10109\" data-end=\"10124\">Central AHU<\/h3>\n<p dir=\"auto\" data-start=\"10126\" data-end=\"10134\"><strong>Handles:<\/strong><\/p>\n<ul data-start=\"10136\" data-end=\"10203\">\n<li data-section-id=\"19hr9x4\" data-start=\"10136\" data-end=\"10147\">Fresh air<\/li>\n<li data-section-id=\"1svglm8\" data-start=\"10148\" data-end=\"10160\">Filtration<\/li>\n<li data-section-id=\"31wylo\" data-start=\"10161\" data-end=\"10179\">Dehumidification<\/li>\n<li data-section-id=\"1tmbj1f\" data-start=\"10180\" data-end=\"10203\">Outdoor-air treatment<\/li>\n<\/ul>\n<h3 dir=\"auto\" data-section-id=\"yn97ut\" data-start=\"10205\" data-end=\"10213\">FCUs<\/h3>\n<p dir=\"auto\" data-start=\"10215\" data-end=\"10222\"><strong>Handle:<\/strong><\/p>\n<ul data-start=\"10224\" data-end=\"10298\">\n<li data-section-id=\"12llv0x\" data-start=\"10224\" data-end=\"10249\">Individual room cooling<\/li>\n<li data-section-id=\"zqiiz2\" data-start=\"10250\" data-end=\"10277\">Local temperature control<\/li>\n<li data-section-id=\"8m2uwz\" data-start=\"10278\" data-end=\"10298\">Zone-level comfort<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"10300\" data-end=\"10332\"><strong>A simplified arrangement can be:<\/strong><\/p>\n<p dir=\"auto\" data-start=\"10334\" data-end=\"10360\"><strong data-start=\"10334\" data-end=\"10360\">Fresh Air System \/ AHU<\/strong><\/p>\n<p dir=\"auto\" data-start=\"10362\" data-end=\"10363\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"10365\" data-end=\"10388\"><strong data-start=\"10365\" data-end=\"10388\">Treated Outdoor Air<\/strong><\/p>\n<p dir=\"auto\" data-start=\"10390\" data-end=\"10391\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"10393\" data-end=\"10402\"><strong data-start=\"10393\" data-end=\"10402\">Rooms<\/strong><\/p>\n<ul data-start=\"10404\" data-end=\"10405\">\n<li data-section-id=\"3szy\" data-start=\"10404\" data-end=\"10405\"><\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"10407\" data-end=\"10418\"><strong data-start=\"10407\" data-end=\"10418\">Chiller<\/strong><\/p>\n<p dir=\"auto\" data-start=\"10420\" data-end=\"10421\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"10423\" data-end=\"10445\"><strong data-start=\"10423\" data-end=\"10445\">Chilled-Water Loop<\/strong><\/p>\n<p dir=\"auto\" data-start=\"10447\" data-end=\"10448\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"10450\" data-end=\"10458\"><strong data-start=\"10450\" data-end=\"10458\">FCUs<\/strong><\/p>\n<p dir=\"auto\" data-start=\"10460\" data-end=\"10461\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"10463\" data-end=\"10483\"><strong data-start=\"10463\" data-end=\"10483\">Individual Rooms<\/strong><\/p>\n<p dir=\"auto\" data-start=\"10485\" data-end=\"10565\">This can provide both centralized ventilation and localized temperature control.<\/p>\n<hr data-start=\"10567\" data-end=\"10570\" \/>\n<h2 dir=\"auto\" data-section-id=\"7x86zo\" data-start=\"10572\" data-end=\"10602\"><span class=\"ez-toc-section\" id=\"FCU_AHU_System_for_a_Hotel\"><\/span>FCU + AHU System for a Hotel<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"10604\" data-end=\"10630\">A hotel is a good example.<\/p>\n<h3 dir=\"auto\" data-section-id=\"zxim8k\" data-start=\"10632\" data-end=\"10655\">Central ventilation<\/h3>\n<p dir=\"auto\" data-start=\"10657\" data-end=\"10695\"><strong data-start=\"10657\" data-end=\"10695\">FAHU\/AHU \u2192 Fresh Air \u2192 Guest Rooms<\/strong><\/p>\n<h3 dir=\"auto\" data-section-id=\"1o6o161\" data-start=\"10697\" data-end=\"10708\">Cooling<\/h3>\n<p dir=\"auto\" data-start=\"10710\" data-end=\"10758\"><strong data-start=\"10710\" data-end=\"10758\">Chiller \u2192 Chilled Water \u2192 FCUs \u2192 Guest Rooms<\/strong><\/p>\n<p dir=\"auto\" data-start=\"10760\" data-end=\"10845\">The FCU provides room-level cooling while the ventilation system manages outdoor air.<\/p>\n<p dir=\"auto\" data-start=\"10847\" data-end=\"10963\">This separation can be useful when the project needs both <strong data-start=\"10905\" data-end=\"10962\">individual comfort control and controlled ventilation<\/strong>.<\/p>\n<hr data-start=\"10965\" data-end=\"10968\" \/>\n<h2 dir=\"auto\" data-section-id=\"q7k34\" data-start=\"10970\" data-end=\"11002\"><span class=\"ez-toc-section\" id=\"FCU_AHU_System_for_an_Office\"><\/span>FCU + AHU System for an Office<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"11004\" data-end=\"11032\"><strong>A commercial office may use:<\/strong><\/p>\n<h3 dir=\"auto\" data-section-id=\"1xxfdlm\" data-start=\"11034\" data-end=\"11041\">AHU<\/h3>\n<p dir=\"auto\" data-start=\"11043\" data-end=\"11047\"><strong>For:<\/strong><\/p>\n<ul data-start=\"11049\" data-end=\"11124\">\n<li data-section-id=\"19hr9x4\" data-start=\"11049\" data-end=\"11060\">Fresh air<\/li>\n<li data-section-id=\"o8e60n\" data-start=\"11061\" data-end=\"11084\">Large open workspaces<\/li>\n<li data-section-id=\"vcwmfn\" data-start=\"11085\" data-end=\"11105\">Central filtration<\/li>\n<li data-section-id=\"1ebqqzs\" data-start=\"11106\" data-end=\"11124\">Air distribution<\/li>\n<\/ul>\n<h3 dir=\"auto\" data-section-id=\"yn97ut\" data-start=\"11126\" data-end=\"11134\">FCUs<\/h3>\n<p dir=\"auto\" data-start=\"11136\" data-end=\"11140\"><strong>For:<\/strong><\/p>\n<ul data-start=\"11142\" data-end=\"11231\">\n<li data-section-id=\"bbisnx\" data-start=\"11142\" data-end=\"11157\">Meeting rooms<\/li>\n<li data-section-id=\"ovyioh\" data-start=\"11158\" data-end=\"11174\">Private cabins<\/li>\n<li data-section-id=\"1f4iroa\" data-start=\"11175\" data-end=\"11188\">Small zones<\/li>\n<li data-section-id=\"zepops\" data-start=\"11189\" data-end=\"11231\">Areas with different operating schedules<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"11233\" data-end=\"11310\">The actual arrangement depends on the building&#8217;s load and ventilation design.<\/p>\n<hr data-start=\"11312\" data-end=\"11315\" \/>\n<h2 dir=\"auto\" data-section-id=\"ci9wl0\" data-start=\"11317\" data-end=\"11357\"><span class=\"ez-toc-section\" id=\"FCU_Without_AHU_What_About_Fresh_Air\"><\/span>FCU Without AHU: What About Fresh Air?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"11359\" data-end=\"11403\">This is one of the most important questions.<\/p>\n<p dir=\"auto\" data-start=\"11405\" data-end=\"11479\">An FCU primarily recirculates and conditions air from the space it serves.<\/p>\n<p dir=\"auto\" data-start=\"11481\" data-end=\"11578\">If a project requires controlled outdoor air, a <strong data-start=\"11529\" data-end=\"11560\">separate ventilation system<\/strong> may be necessary.<\/p>\n<p dir=\"auto\" data-start=\"11580\" data-end=\"11607\"><strong>Possible solutions include:<\/strong><\/p>\n<ul data-start=\"11609\" data-end=\"11786\">\n<li data-section-id=\"1ycfiga\" data-start=\"11609\" data-end=\"11641\">Fresh Air Handling Unit (FAHU)<\/li>\n<li data-section-id=\"160w0q4\" data-start=\"11642\" data-end=\"11679\">Dedicated Outdoor Air System (DOAS)<\/li>\n<li data-section-id=\"i3rf7b\" data-start=\"11680\" data-end=\"11711\">Mechanical ventilation system<\/li>\n<li data-section-id=\"rizuyv\" data-start=\"11712\" data-end=\"11738\">Treated fresh-air system<\/li>\n<li data-section-id=\"1prhiz4\" data-start=\"11739\" data-end=\"11786\">Appropriately designed outdoor-air connection<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"11788\" data-end=\"11974\">ASHRAE describes systems where ventilation air can be supplied from a central air handler to fan-coils, with appropriate treatment of outdoor air.<\/p>\n<p dir=\"auto\" data-start=\"11976\" data-end=\"11986\"><strong>Therefore:<\/strong><\/p>\n<blockquote data-start=\"11988\" data-end=\"12077\">\n<p dir=\"auto\" data-start=\"11990\" data-end=\"12077\"><strong data-start=\"11990\" data-end=\"12077\">FCU cooling and building ventilation are two related but separate design questions.<\/strong><\/p>\n<\/blockquote>\n<hr data-start=\"12079\" data-end=\"12082\" \/>\n<h2 dir=\"auto\" data-section-id=\"1ioaart\" data-start=\"12084\" data-end=\"12115\"><span class=\"ez-toc-section\" id=\"Can_an_FCU_Provide_Fresh_Air\"><\/span>Can an FCU Provide Fresh Air?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"12117\" data-end=\"12233\">Some fan-coil configurations can incorporate outdoor air, but the suitability depends on the specific system design.<\/p>\n<p dir=\"auto\" data-start=\"12235\" data-end=\"12514\">ASHRAE discusses fan-coil systems that can receive ventilation air from an outside-wall penetration or central air handler, while warning about uncontrolled outdoor-air quantities through building-envelope openings in commercial buildings.<\/p>\n<p dir=\"auto\" data-start=\"12516\" data-end=\"12718\">For a commercial project, it is therefore better to have the ventilation strategy professionally designed rather than assuming that a wall opening connected to an FCU solves the outdoor-air requirement.<\/p>\n<hr data-start=\"12720\" data-end=\"12723\" \/>\n<h2 dir=\"auto\" data-section-id=\"9gir5h\" data-start=\"12725\" data-end=\"12753\"><span class=\"ez-toc-section\" id=\"FCU_vs_AHU_Key_Difference\"><\/span>FCU vs AHU: Key Difference<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div class=\"group TyagGW_tableContainer\" dir=\"auto\">\n<div class=\"TyagGW_tableWrapper flex flex-col-reverse w-fit\" tabindex=\"-1\">\n<table class=\"w-fit min-w-(--thread-content-width)\" dir=\"auto\" style=\"height: 479px;\" width=\"873\" data-start=\"12755\" data-end=\"13539\">\n<thead data-start=\"12755\" data-end=\"12780\">\n<tr data-start=\"12755\" data-end=\"12780\">\n<th class=\"last:pe-10\" data-start=\"12755\" data-end=\"12767\" data-col-size=\"sm\">Parameter<\/th>\n<th class=\"last:pe-10\" data-start=\"12767\" data-end=\"12773\" data-col-size=\"sm\">FCU<\/th>\n<th class=\"last:pe-10\" data-start=\"12773\" data-end=\"12780\" data-col-size=\"sm\">AHU<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"12795\" data-end=\"13539\">\n<tr data-start=\"12795\" data-end=\"12844\">\n<td data-start=\"12795\" data-end=\"12807\" data-col-size=\"sm\">Full form<\/td>\n<td data-start=\"12807\" data-end=\"12823\" data-col-size=\"sm\">Fan Coil Unit<\/td>\n<td data-start=\"12823\" data-end=\"12844\" data-col-size=\"sm\">Air Handling Unit<\/td>\n<\/tr>\n<tr data-start=\"12845\" data-end=\"12905\">\n<td data-start=\"12845\" data-end=\"12860\" data-col-size=\"sm\">Typical role<\/td>\n<td data-start=\"12860\" data-end=\"12881\" data-col-size=\"sm\">Local conditioning<\/td>\n<td data-start=\"12881\" data-end=\"12905\" data-col-size=\"sm\">Central air handling<\/td>\n<\/tr>\n<tr data-start=\"12906\" data-end=\"12933\">\n<td data-start=\"12906\" data-end=\"12913\" data-col-size=\"sm\">Size<\/td>\n<td data-start=\"12913\" data-end=\"12923\" data-col-size=\"sm\">Smaller<\/td>\n<td data-start=\"12923\" data-end=\"12933\" data-col-size=\"sm\">Larger<\/td>\n<\/tr>\n<tr data-start=\"12934\" data-end=\"12969\">\n<td data-start=\"12934\" data-end=\"12944\" data-col-size=\"sm\">Airflow<\/td>\n<td data-start=\"12944\" data-end=\"12952\" data-col-size=\"sm\">Lower<\/td>\n<td data-start=\"12952\" data-end=\"12969\" data-col-size=\"sm\">Higher\/custom<\/td>\n<\/tr>\n<tr data-start=\"12970\" data-end=\"13023\">\n<td data-start=\"12970\" data-end=\"12985\" data-col-size=\"sm\">Zone control<\/td>\n<td data-start=\"12985\" data-end=\"12997\" data-col-size=\"sm\">Excellent<\/td>\n<td data-start=\"12997\" data-end=\"13023\" data-col-size=\"sm\">Central\/zone dependent<\/td>\n<\/tr>\n<tr data-start=\"13024\" data-end=\"13085\">\n<td data-start=\"13024\" data-end=\"13036\" data-col-size=\"sm\">Fresh air<\/td>\n<td data-start=\"13036\" data-end=\"13064\" data-col-size=\"sm\">Usually separate strategy<\/td>\n<td data-start=\"13064\" data-end=\"13085\" data-col-size=\"sm\">Can be integrated<\/td>\n<\/tr>\n<tr data-start=\"13086\" data-end=\"13134\">\n<td data-start=\"13086\" data-end=\"13099\" data-col-size=\"sm\">Filtration<\/td>\n<td data-start=\"13099\" data-end=\"13113\" data-col-size=\"sm\">Basic\/local<\/td>\n<td data-start=\"13113\" data-end=\"13134\" data-col-size=\"sm\">More configurable<\/td>\n<\/tr>\n<tr data-start=\"13135\" data-end=\"13172\">\n<td data-start=\"13135\" data-end=\"13146\" data-col-size=\"sm\">Ductwork<\/td>\n<td data-start=\"13146\" data-end=\"13162\" data-col-size=\"sm\">Minimal\/local<\/td>\n<td data-start=\"13162\" data-end=\"13172\" data-col-size=\"sm\">Common<\/td>\n<\/tr>\n<tr data-start=\"13173\" data-end=\"13221\">\n<td data-start=\"13173\" data-end=\"13187\" data-col-size=\"sm\">Application<\/td>\n<td data-start=\"13187\" data-end=\"13201\" data-col-size=\"sm\">Rooms\/zones<\/td>\n<td data-start=\"13201\" data-end=\"13221\" data-col-size=\"sm\">Floors\/buildings<\/td>\n<\/tr>\n<tr data-start=\"13222\" data-end=\"13257\">\n<td data-start=\"13222\" data-end=\"13238\" data-col-size=\"sm\">Chilled water<\/td>\n<td data-start=\"13238\" data-end=\"13247\" data-col-size=\"sm\">Common<\/td>\n<td data-start=\"13247\" data-end=\"13257\" data-col-size=\"sm\">Common<\/td>\n<\/tr>\n<tr data-start=\"13258\" data-end=\"13285\">\n<td data-start=\"13258\" data-end=\"13264\" data-col-size=\"sm\">BMS<\/td>\n<td data-start=\"13264\" data-end=\"13275\" data-col-size=\"sm\">Possible<\/td>\n<td data-start=\"13275\" data-end=\"13285\" data-col-size=\"sm\">Common<\/td>\n<\/tr>\n<tr data-start=\"13286\" data-end=\"13356\">\n<td data-start=\"13286\" data-end=\"13293\" data-col-size=\"sm\">HEPA<\/td>\n<td data-start=\"13293\" data-end=\"13317\" data-col-size=\"sm\">Application dependent<\/td>\n<td data-start=\"13317\" data-end=\"13356\" data-col-size=\"sm\">More common for specialized systems<\/td>\n<\/tr>\n<tr data-start=\"13357\" data-end=\"13429\">\n<td data-start=\"13357\" data-end=\"13376\" data-col-size=\"sm\">Humidity control<\/td>\n<td data-start=\"13376\" data-end=\"13408\" data-col-size=\"sm\">Limited\/application dependent<\/td>\n<td data-start=\"13408\" data-end=\"13429\" data-col-size=\"sm\">More configurable<\/td>\n<\/tr>\n<tr data-start=\"13430\" data-end=\"13489\">\n<td data-start=\"13430\" data-end=\"13445\" data-col-size=\"sm\">Installation<\/td>\n<td data-start=\"13445\" data-end=\"13466\" data-col-size=\"sm\">Relatively compact<\/td>\n<td data-start=\"13466\" data-end=\"13489\" data-col-size=\"sm\">More infrastructure<\/td>\n<\/tr>\n<tr data-start=\"13490\" data-end=\"13539\">\n<td data-start=\"13490\" data-end=\"13504\" data-col-size=\"sm\">Maintenance<\/td>\n<td data-start=\"13504\" data-end=\"13518\" data-col-size=\"sm\">Local units<\/td>\n<td data-start=\"13518\" data-end=\"13539\" data-col-size=\"sm\">Central equipment<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p dir=\"auto\" data-start=\"13541\" data-end=\"13738\">VIPUL&#8217;s own AHU information describes AHUs as equipment for larger HVAC systems, while its FCU offering focuses on individual room-level temperature control.<\/p>\n<hr data-start=\"13740\" data-end=\"13743\" \/>\n<h2 dir=\"auto\" data-section-id=\"ygey1x\" data-start=\"13745\" data-end=\"13775\"><span class=\"ez-toc-section\" id=\"Which_Is_Better_FCU_or_AHU\"><\/span>Which Is Better: FCU or AHU?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"13777\" data-end=\"13806\">There is no universal answer.<\/p>\n<p dir=\"auto\" data-start=\"13808\" data-end=\"13838\"><strong>The correct system depends on:<\/strong><\/p>\n<ul data-start=\"13840\" data-end=\"14105\">\n<li data-section-id=\"1shjxvf\" data-start=\"13840\" data-end=\"13855\">Building size<\/li>\n<li data-section-id=\"1un5noh\" data-start=\"13856\" data-end=\"13870\">Cooling load<\/li>\n<li data-section-id=\"1iy3v5h\" data-start=\"13871\" data-end=\"13897\">Ventilation requirements<\/li>\n<li data-section-id=\"1cpkq27\" data-start=\"13898\" data-end=\"13915\">Number of zones<\/li>\n<li data-section-id=\"jlyb8\" data-start=\"13916\" data-end=\"13932\">Ceiling height<\/li>\n<li data-section-id=\"zwk8sy\" data-start=\"13933\" data-end=\"13956\">Available plant space<\/li>\n<li data-section-id=\"1ydr5tv\" data-start=\"13957\" data-end=\"13980\">Ductwork requirements<\/li>\n<li data-section-id=\"1aapu96\" data-start=\"13981\" data-end=\"14004\">Fresh-air requirement<\/li>\n<li data-section-id=\"1svglm8\" data-start=\"14005\" data-end=\"14017\">Filtration<\/li>\n<li data-section-id=\"y8v3jx\" data-start=\"14018\" data-end=\"14041\">Humidity requirements<\/li>\n<li data-section-id=\"xpqc0\" data-start=\"14042\" data-end=\"14062\">Operating schedule<\/li>\n<li data-section-id=\"nfitgu\" data-start=\"14063\" data-end=\"14085\">Maintenance strategy<\/li>\n<li data-section-id=\"msd1au\" data-start=\"14086\" data-end=\"14105\">Energy objectives<\/li>\n<\/ul>\n<h3 dir=\"auto\" data-section-id=\"hftc8d\" data-start=\"14107\" data-end=\"14139\">FCU may be appropriate when:<\/h3>\n<ul data-start=\"14141\" data-end=\"14333\">\n<li data-section-id=\"aaamee\" data-start=\"14141\" data-end=\"14184\">Individual rooms need independent control<\/li>\n<li data-section-id=\"q43pax\" data-start=\"14185\" data-end=\"14212\">Local cooling is required<\/li>\n<li data-section-id=\"1m72n57\" data-start=\"14213\" data-end=\"14249\">Large duct systems are undesirable<\/li>\n<li data-section-id=\"qntqmv\" data-start=\"14250\" data-end=\"14293\">Chilled-water infrastructure is available<\/li>\n<li data-section-id=\"aezpk1\" data-start=\"14294\" data-end=\"14333\">The project has many individual zones<\/li>\n<\/ul>\n<h3 dir=\"auto\" data-section-id=\"25d64h\" data-start=\"14335\" data-end=\"14367\">AHU may be appropriate when:<\/h3>\n<ul data-start=\"14369\" data-end=\"14590\">\n<li data-section-id=\"68bbfy\" data-start=\"14369\" data-end=\"14396\">Large airflow is required<\/li>\n<li data-section-id=\"lf0ru1\" data-start=\"14397\" data-end=\"14430\">Central ventilation is required<\/li>\n<li data-section-id=\"1md6e8a\" data-start=\"14431\" data-end=\"14479\">Multiple spaces need centralized air treatment<\/li>\n<li data-section-id=\"1lumm1p\" data-start=\"14480\" data-end=\"14513\">Advanced filtration is required<\/li>\n<li data-section-id=\"v1wqay\" data-start=\"14514\" data-end=\"14545\">Humidity control is important<\/li>\n<li data-section-id=\"bgvgzm\" data-start=\"14546\" data-end=\"14590\">Extensive duct distribution is appropriate<\/li>\n<\/ul>\n<hr data-start=\"14592\" data-end=\"14595\" \/>\n<h2 dir=\"auto\" data-section-id=\"bmy8e6\" data-start=\"14597\" data-end=\"14634\"><span class=\"ez-toc-section\" id=\"Can_FCU_Work_Without_Chilled_Water\"><\/span>Can FCU Work Without Chilled Water?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"14636\" data-end=\"14672\">This depends on the <strong data-start=\"14656\" data-end=\"14671\">type of FCU<\/strong>.<\/p>\n<p dir=\"auto\" data-start=\"14674\" data-end=\"14715\">Hydronic FCUs use water through the coil.<\/p>\n<p dir=\"auto\" data-start=\"14717\" data-end=\"14873\">Other fan-coil configurations can use DX\/refrigerant cooling. ASHRAE recognizes both hydronic and DX fan-coil units.<\/p>\n<p dir=\"auto\" data-start=\"14875\" data-end=\"15012\">However, VIPUL&#8217;s current FCU offering specifically lists <strong data-start=\"14932\" data-end=\"14971\">chilled water as its cooling medium<\/strong>.<\/p>\n<p dir=\"auto\" data-start=\"15014\" data-end=\"15067\">So when discussing a VIPUL chilled-water FCU project:<\/p>\n<blockquote data-start=\"15069\" data-end=\"15154\">\n<p dir=\"auto\" data-start=\"15071\" data-end=\"15154\"><strong data-start=\"15071\" data-end=\"15154\">FCU does not need an AHU, but it does need an appropriate chilled-water source.<\/strong><\/p>\n<\/blockquote>\n<hr data-start=\"15156\" data-end=\"15159\" \/>\n<h2 dir=\"auto\" data-section-id=\"i8wysc\" data-start=\"15161\" data-end=\"15194\"><span class=\"ez-toc-section\" id=\"Can_FCU_Work_Without_a_Chiller\"><\/span>Can FCU Work Without a Chiller?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"15196\" data-end=\"15232\">Again, this depends on the FCU type.<\/p>\n<p dir=\"auto\" data-start=\"15234\" data-end=\"15309\">For a <strong data-start=\"15240\" data-end=\"15261\">chilled-water FCU<\/strong>, there must be a suitable chilled-water source.<\/p>\n<p dir=\"auto\" data-start=\"15311\" data-end=\"15346\"><strong>A typical commercial system may be:<\/strong><\/p>\n<p dir=\"auto\" data-start=\"15348\" data-end=\"15372\"><strong data-start=\"15348\" data-end=\"15372\">Chiller \u2192 Pump \u2192 FCU<\/strong><\/p>\n<p dir=\"auto\" data-start=\"15374\" data-end=\"15460\">Without chilled water reaching the coil, the FCU cannot provide chilled-water cooling.<\/p>\n<p dir=\"auto\" data-start=\"15462\" data-end=\"15576\">A DX-type fan-coil configuration is different because the cooling source is refrigerant rather than chilled water.<\/p>\n<hr data-start=\"15578\" data-end=\"15581\" \/>\n<h2 dir=\"auto\" data-section-id=\"ei19ae\" data-start=\"15583\" data-end=\"15633\"><span class=\"ez-toc-section\" id=\"What_Is_the_Difference_Between_FCU_and_Split_AC\"><\/span>What Is the Difference Between FCU and Split AC?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"15635\" data-end=\"15731\">An FCU and split AC can both provide local cooling, but their cooling architecture is different.<\/p>\n<h3 dir=\"auto\" data-section-id=\"446nhy\" data-start=\"15733\" data-end=\"15745\">Split AC<\/h3>\n<p dir=\"auto\" data-start=\"15747\" data-end=\"15755\"><strong>Usually:<\/strong><\/p>\n<p dir=\"auto\" data-start=\"15757\" data-end=\"15819\"><strong data-start=\"15757\" data-end=\"15819\">Indoor Unit \u2192 Refrigerant Piping \u2192 Outdoor Condensing Unit<\/strong><\/p>\n<h3 dir=\"auto\" data-section-id=\"1v3pi99\" data-start=\"15821\" data-end=\"15842\">Chilled-Water FCU<\/h3>\n<p dir=\"auto\" data-start=\"15844\" data-end=\"15852\"><strong>Usually:<\/strong><\/p>\n<p dir=\"auto\" data-start=\"15854\" data-end=\"15902\"><strong data-start=\"15854\" data-end=\"15902\">FCU \u2192 Chilled-Water Piping \u2192 Central Chiller<\/strong><\/p>\n<p dir=\"auto\" data-start=\"15904\" data-end=\"15979\">An FCU therefore commonly forms part of a centralized chilled-water system.<\/p>\n<hr data-start=\"15981\" data-end=\"15984\" \/>\n<h2 dir=\"auto\" data-section-id=\"5lzr4k\" data-start=\"15986\" data-end=\"16031\"><span class=\"ez-toc-section\" id=\"What_Is_the_Difference_Between_FCU_and_VRF\"><\/span>What Is the Difference Between FCU and VRF?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 dir=\"auto\" data-section-id=\"1xxf4c6\" data-start=\"16033\" data-end=\"16040\">FCU<\/h3>\n<p dir=\"auto\" data-start=\"16042\" data-end=\"16056\"><strong>Commonly uses:<\/strong><\/p>\n<p dir=\"auto\" data-start=\"16058\" data-end=\"16093\"><strong data-start=\"16058\" data-end=\"16093\">Chilled Water \u2192 Coil \u2192 Room Air<\/strong><\/p>\n<h3 dir=\"auto\" data-section-id=\"1xxfhc4\" data-start=\"16095\" data-end=\"16102\">VRF<\/h3>\n<p dir=\"auto\" data-start=\"16104\" data-end=\"16109\"><strong>Uses:<\/strong><\/p>\n<p dir=\"auto\" data-start=\"16111\" data-end=\"16151\"><strong data-start=\"16111\" data-end=\"16151\">Refrigerant \u2192 Indoor Unit \u2192 Room Air<\/strong><\/p>\n<p dir=\"auto\" data-start=\"16153\" data-end=\"16231\">VRF can provide individual zone control without a central chilled-water plant.<\/p>\n<p dir=\"auto\" data-start=\"16233\" data-end=\"16306\"><strong>Therefore, when planning a multi-zone HVAC system, engineers may compare:<\/strong><\/p>\n<ul data-start=\"16308\" data-end=\"16373\">\n<li data-section-id=\"1bsfmti\" data-start=\"16308\" data-end=\"16323\">FCU + Chiller<\/li>\n<li data-section-id=\"1o4wfe\" data-start=\"16324\" data-end=\"16329\">VRF<\/li>\n<li data-section-id=\"10228a2\" data-start=\"16330\" data-end=\"16345\">AHU + Chiller<\/li>\n<li data-section-id=\"15sx9hv\" data-start=\"16346\" data-end=\"16373\">Other HVAC configurations<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"16375\" data-end=\"16429\">The correct selection depends on project requirements.<\/p>\n<hr data-start=\"16431\" data-end=\"16434\" \/>\n<h2 dir=\"auto\" data-section-id=\"116icsx\" data-start=\"16436\" data-end=\"16458\"><span class=\"ez-toc-section\" id=\"Example_Small_Hotel\"><\/span>Example: Small Hotel<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"16460\" data-end=\"16496\">Suppose a hotel has 100 guest rooms.<\/p>\n<p dir=\"auto\" data-start=\"16498\" data-end=\"16521\"><strong>One possible design is:<\/strong><\/p>\n<p dir=\"auto\" data-start=\"16523\" data-end=\"16542\"><strong data-start=\"16523\" data-end=\"16542\">Central Chiller<\/strong><\/p>\n<p dir=\"auto\" data-start=\"16544\" data-end=\"16545\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"16547\" data-end=\"16570\"><strong data-start=\"16547\" data-end=\"16570\">Chilled-Water Pumps<\/strong><\/p>\n<p dir=\"auto\" data-start=\"16572\" data-end=\"16573\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"16575\" data-end=\"16599\"><strong data-start=\"16575\" data-end=\"16599\">Chilled-Water Piping<\/strong><\/p>\n<p dir=\"auto\" data-start=\"16601\" data-end=\"16602\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"16604\" data-end=\"16616\"><strong data-start=\"16604\" data-end=\"16616\">100 FCUs<\/strong><\/p>\n<p dir=\"auto\" data-start=\"16618\" data-end=\"16619\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"16621\" data-end=\"16640\"><strong data-start=\"16621\" data-end=\"16640\">100 Guest Rooms<\/strong><\/p>\n<p dir=\"auto\" data-start=\"16642\" data-end=\"16694\">A separate fresh-air system can provide ventilation.<\/p>\n<p dir=\"auto\" data-start=\"16696\" data-end=\"16769\">There is no requirement for one large AHU to directly cool all 100 rooms.<\/p>\n<hr data-start=\"16771\" data-end=\"16774\" \/>\n<h2 dir=\"auto\" data-section-id=\"13vhg35\" data-start=\"16776\" data-end=\"16806\"><span class=\"ez-toc-section\" id=\"Example_Large_Shopping_Mall\"><\/span>Example: Large Shopping Mall<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"16808\" data-end=\"16824\"><strong>A mall may have:<\/strong><\/p>\n<ul data-start=\"16826\" data-end=\"16912\">\n<li data-section-id=\"q88i0m\" data-start=\"16826\" data-end=\"16846\">Large retail areas<\/li>\n<li data-section-id=\"n6f8e9\" data-start=\"16847\" data-end=\"16861\">Common areas<\/li>\n<li data-section-id=\"11vnrmd\" data-start=\"16862\" data-end=\"16874\">Food court<\/li>\n<li data-section-id=\"11vfdtz\" data-start=\"16875\" data-end=\"16886\">Corridors<\/li>\n<li data-section-id=\"1q165iz\" data-start=\"16887\" data-end=\"16896\">Offices<\/li>\n<li data-section-id=\"r64d75\" data-start=\"16897\" data-end=\"16912\">Service areas<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"16914\" data-end=\"17026\">A centralized AHU system may be suitable for some large spaces, while FCUs may be appropriate for smaller zones.<\/p>\n<p dir=\"auto\" data-start=\"17028\" data-end=\"17082\">A mixed HVAC architecture can therefore be considered.<\/p>\n<hr data-start=\"17084\" data-end=\"17087\" \/>\n<h2 dir=\"auto\" data-section-id=\"qqzk00\" data-start=\"17089\" data-end=\"17108\"><span class=\"ez-toc-section\" id=\"Example_Hospital\"><\/span>Example: Hospital<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"17110\" data-end=\"17144\">Hospital HVAC is more specialized.<\/p>\n<p dir=\"auto\" data-start=\"17146\" data-end=\"17194\"><strong>Different areas may have different requirements:<\/strong><\/p>\n<ul data-start=\"17196\" data-end=\"17306\">\n<li data-section-id=\"2ypfnb\" data-start=\"17196\" data-end=\"17211\">Patient rooms<\/li>\n<li data-section-id=\"1q165iz\" data-start=\"17212\" data-end=\"17221\">Offices<\/li>\n<li data-section-id=\"11vfdtz\" data-start=\"17222\" data-end=\"17233\">Corridors<\/li>\n<li data-section-id=\"psxos9\" data-start=\"17234\" data-end=\"17251\">Operating rooms<\/li>\n<li data-section-id=\"2czu5c\" data-start=\"17252\" data-end=\"17269\">Isolation rooms<\/li>\n<li data-section-id=\"ku3rl9\" data-start=\"17270\" data-end=\"17284\">Laboratories<\/li>\n<li data-section-id=\"1x03cuq\" data-start=\"17285\" data-end=\"17306\">Critical care areas<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"17308\" data-end=\"17468\">The decision between AHU, FCU or another system should be based on the specific room&#8217;s ventilation, filtration, pressure, temperature and humidity requirements.<\/p>\n<p dir=\"auto\" data-start=\"17470\" data-end=\"17571\">It would not be appropriate to assume that one FCU configuration is suitable for every hospital area.<\/p>\n<hr data-start=\"17573\" data-end=\"17576\" \/>\n<h2 dir=\"auto\" data-section-id=\"17ogt10\" data-start=\"17578\" data-end=\"17634\"><span class=\"ez-toc-section\" id=\"7_Things_to_Check_Before_Installing_an_FCU_Without_AHU\"><\/span>7 Things to Check Before Installing an FCU Without AHU<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 dir=\"auto\" data-section-id=\"qeyvmb\" data-start=\"17636\" data-end=\"17654\">1. Cooling Load<\/h3>\n<p dir=\"auto\" data-start=\"17656\" data-end=\"17704\">Calculate the room&#8217;s actual cooling requirement.<\/p>\n<h3 dir=\"auto\" data-section-id=\"156jddf\" data-start=\"17706\" data-end=\"17738\">2. Chilled-Water Availability<\/h3>\n<p dir=\"auto\" data-start=\"17740\" data-end=\"17799\">Confirm the water temperature, flow and available pressure.<\/p>\n<h3 dir=\"auto\" data-section-id=\"1l600my\" data-start=\"17801\" data-end=\"17828\">3. Fresh-Air Requirement<\/h3>\n<p dir=\"auto\" data-start=\"17830\" data-end=\"17889\">Determine whether the room requires mechanical outdoor air.<\/p>\n<h3 dir=\"auto\" data-section-id=\"11dqrmv\" data-start=\"17891\" data-end=\"17907\">4. Filtration<\/h3>\n<p dir=\"auto\" data-start=\"17909\" data-end=\"17946\">Select the required filtration level.<\/p>\n<h3 dir=\"auto\" data-section-id=\"pq4uw0\" data-start=\"17948\" data-end=\"17959\">5. Noise<\/h3>\n<p dir=\"auto\" data-start=\"17961\" data-end=\"18009\">Check the FCU&#8217;s sound level for the application.<\/p>\n<h3 dir=\"auto\" data-section-id=\"85g0g0\" data-start=\"18011\" data-end=\"18036\">6. Condensate Drainage<\/h3>\n<p dir=\"auto\" data-start=\"18038\" data-end=\"18075\">Provide suitable condensate drainage.<\/p>\n<h3 dir=\"auto\" data-section-id=\"sgcx0o\" data-start=\"18077\" data-end=\"18091\">7. Controls<\/h3>\n<p dir=\"auto\" data-start=\"18093\" data-end=\"18139\">Select thermostat, valve and BMS requirements.<\/p>\n<hr data-start=\"18141\" data-end=\"18144\" \/>\n<h2 dir=\"auto\" data-section-id=\"168of3q\" data-start=\"18146\" data-end=\"18172\"><span class=\"ez-toc-section\" id=\"VIPUL_HVAC_FCU_Solutions\"><\/span>VIPUL HVAC FCU Solutions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"18174\" data-end=\"18279\">VIPUL HVAC Solution Pvt. Ltd. currently offers FCU solutions for residential and commercial applications.<\/p>\n<p dir=\"auto\" data-start=\"18281\" data-end=\"18322\"><strong>Its published FCU specifications include:<\/strong><\/p>\n<ul data-start=\"18324\" data-end=\"18611\">\n<li data-section-id=\"1dm8o6b\" data-start=\"18324\" data-end=\"18354\"><strong data-start=\"18326\" data-end=\"18339\">Capacity:<\/strong> 0.5 TR to 5 TR<\/li>\n<li data-section-id=\"p0xmbi\" data-start=\"18355\" data-end=\"18394\"><strong data-start=\"18357\" data-end=\"18366\">Type:<\/strong> Ceiling concealed \/ exposed<\/li>\n<li data-section-id=\"1ji2nw6\" data-start=\"18395\" data-end=\"18430\"><strong data-start=\"18397\" data-end=\"18416\">Cooling medium:<\/strong> Chilled water<\/li>\n<li data-section-id=\"1nuu1l\" data-start=\"18431\" data-end=\"18457\"><strong data-start=\"18433\" data-end=\"18445\">Airflow:<\/strong> Multi-speed<\/li>\n<li data-section-id=\"1hopybd\" data-start=\"18458\" data-end=\"18487\"><strong data-start=\"18460\" data-end=\"18470\">Noise:<\/strong> Low-noise design<\/li>\n<li data-section-id=\"mgndb9\" data-start=\"18488\" data-end=\"18526\"><strong data-start=\"18490\" data-end=\"18503\">Controls:<\/strong> Thermostat \/ BMS ready<\/li>\n<li data-section-id=\"17590uc\" data-start=\"18527\" data-end=\"18611\"><strong data-start=\"18529\" data-end=\"18542\">Drainage:<\/strong> Condensate management system<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"18613\" data-end=\"18812\">VIPUL also provides AHU solutions for larger centralized HVAC applications, including customized CFM selection, filtration, coils, fans and BMS-ready controls.<\/p>\n<p dir=\"auto\" data-start=\"18814\" data-end=\"18954\">This allows the HVAC system to be designed according to the project&#8217;s actual requirements rather than automatically choosing one technology.<\/p>\n<hr data-start=\"18956\" data-end=\"18959\" \/>\n<h2 dir=\"auto\" data-section-id=\"57k58o\" data-start=\"18961\" data-end=\"18985\"><span class=\"ez-toc-section\" id=\"Why_Choose_VIPUL_HVAC\"><\/span>Why Choose VIPUL HVAC?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"18987\" data-end=\"19029\"><strong>VIPUL HVAC can support projects involving:<\/strong><\/p>\n<ul data-start=\"19031\" data-end=\"19261\">\n<li data-section-id=\"mvxyt4\" data-start=\"19031\" data-end=\"19046\">FCU selection<\/li>\n<li data-section-id=\"yrv5n8\" data-start=\"19047\" data-end=\"19062\">AHU selection<\/li>\n<li data-section-id=\"1asd9vh\" data-start=\"19063\" data-end=\"19082\">Chiller selection<\/li>\n<li data-section-id=\"19sag5u\" data-start=\"19083\" data-end=\"19106\">Heat-load calculation<\/li>\n<li data-section-id=\"60drwa\" data-start=\"19107\" data-end=\"19129\">Chilled-water piping<\/li>\n<li data-section-id=\"uwo89b\" data-start=\"19130\" data-end=\"19140\">Ductwork<\/li>\n<li data-section-id=\"1oyp4n8\" data-start=\"19141\" data-end=\"19164\">Fresh-air ventilation<\/li>\n<li data-section-id=\"rp7r4\" data-start=\"19165\" data-end=\"19180\">HVAC controls<\/li>\n<li data-section-id=\"ribm16\" data-start=\"19181\" data-end=\"19198\">BMS integration<\/li>\n<li data-section-id=\"1tl2ot0\" data-start=\"19199\" data-end=\"19213\">Installation<\/li>\n<li data-section-id=\"19quzku\" data-start=\"19214\" data-end=\"19223\">Testing<\/li>\n<li data-section-id=\"akz4v9\" data-start=\"19224\" data-end=\"19239\">Commissioning<\/li>\n<li data-section-id=\"1ogygep\" data-start=\"19240\" data-end=\"19261\">AMC and maintenance<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"19263\" data-end=\"19313\"><strong>A complete chilled-water HVAC project may involve:<\/strong><\/p>\n<p dir=\"auto\" data-start=\"19315\" data-end=\"19392\"><strong data-start=\"19315\" data-end=\"19392\">Chiller \u2192 Pumps \u2192 Piping \u2192 AHU\/FCU \u2192 Ductwork\/Air Distribution \u2192 Controls<\/strong><\/p>\n<p dir=\"auto\" data-start=\"19394\" data-end=\"19550\">VIPUL&#8217;s current HVAC portfolio includes FCUs, AHUs, chillers, ductwork, ventilation systems and BMS\/HVAC automation.<\/p>\n<hr data-start=\"19552\" data-end=\"19555\" \/>\n<h2 dir=\"auto\" data-section-id=\"hkd5a4\" data-start=\"19557\" data-end=\"19585\"><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions\"><\/span>Frequently Asked Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 dir=\"auto\" data-section-id=\"tan9av\" data-start=\"19587\" data-end=\"19615\">Can FCU work without AHU?<\/h3>\n<p dir=\"auto\" data-start=\"19617\" data-end=\"19830\"><strong data-start=\"19617\" data-end=\"19625\">Yes.<\/strong> An FCU can operate independently of an AHU. A chilled-water FCU still requires a suitable chilled-water source, normally a chiller or other hydronic cooling source.<\/p>\n<h3 dir=\"auto\" data-section-id=\"1vdur55\" data-start=\"19832\" data-end=\"19859\">Does FCU need a chiller?<\/h3>\n<p dir=\"auto\" data-start=\"19861\" data-end=\"20043\">A <strong data-start=\"19863\" data-end=\"19904\">chilled-water FCU needs chilled water<\/strong>, which is commonly supplied by a chiller. A DX fan-coil configuration can use refrigerant instead.<\/p>\n<h3 dir=\"auto\" data-section-id=\"1joyzgl\" data-start=\"20045\" data-end=\"20074\">Can FCU provide fresh air?<\/h3>\n<p dir=\"auto\" data-start=\"20076\" data-end=\"20316\">An FCU can be part of a system that introduces outdoor air, but the ventilation arrangement must be properly designed. A separate FAHU\/DOAS\/ventilation system may be required depending on the project.<\/p>\n<h3 dir=\"auto\" data-section-id=\"1f0c98i\" data-start=\"20318\" data-end=\"20351\">Can FCU and AHU work together?<\/h3>\n<p dir=\"auto\" data-start=\"20353\" data-end=\"20477\"><strong data-start=\"20353\" data-end=\"20361\">Yes.<\/strong> An AHU can handle centralized ventilation and air treatment while FCUs provide individual zone temperature control.<\/p>\n<h3 dir=\"auto\" data-section-id=\"183yvan\" data-start=\"20479\" data-end=\"20505\">Is FCU better than AHU?<\/h3>\n<p dir=\"auto\" data-start=\"20507\" data-end=\"20678\">Neither is universally better. FCUs are generally suited to localized\/zone conditioning, while AHUs are commonly used for larger centralized air handling and distribution.<\/p>\n<h3 dir=\"auto\" data-section-id=\"1c8ciab\" data-start=\"20680\" data-end=\"20723\">Can an FCU cool a room without ductwork?<\/h3>\n<p dir=\"auto\" data-start=\"20725\" data-end=\"20821\">Yes. Many FCUs can provide air directly to the room, although some configurations can be ducted.<\/p>\n<h3 dir=\"auto\" data-section-id=\"180t91x\" data-start=\"20823\" data-end=\"20856\">Can an FCU be used in a hotel?<\/h3>\n<p dir=\"auto\" data-start=\"20858\" data-end=\"21006\">Yes. FCUs are commonly used for individual guest-room temperature control. Ventilation must be addressed separately or through an integrated design.<\/p>\n<h3 dir=\"auto\" data-section-id=\"1enqmgm\" data-start=\"21008\" data-end=\"21053\">Can FCU work without a central air system?<\/h3>\n<p dir=\"auto\" data-start=\"21055\" data-end=\"21209\">Yes. ASHRAE specifically notes that fan-coil units can operate independently of a central air-distribution system.<\/p>\n<hr data-start=\"21211\" data-end=\"21214\" \/>\n<h2 dir=\"auto\" data-section-id=\"aoygke\" data-start=\"21216\" data-end=\"21257\"><span class=\"ez-toc-section\" id=\"Final_Answer_Can_FCU_Work_Without_AHU\"><\/span>Final Answer: Can FCU Work Without AHU?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 dir=\"auto\" data-section-id=\"2nzc92\" data-start=\"21259\" data-end=\"21303\"><span role=\"text\"><strong data-start=\"21263\" data-end=\"21303\">Yes, an FCU can work without an AHU.<\/strong><\/span><\/h3>\n<p dir=\"auto\" data-start=\"21305\" data-end=\"21344\"><strong>A typical chilled-water arrangement is:<\/strong><\/p>\n<p dir=\"auto\" data-start=\"21346\" data-end=\"21414\"><strong data-start=\"21346\" data-end=\"21414\">Chiller \u2192 Chilled-Water Pump \u2192 Chilled-Water Piping \u2192 FCU \u2192 Room<\/strong><\/p>\n<p dir=\"auto\" data-start=\"21416\" data-end=\"21474\">The FCU handles <strong data-start=\"21432\" data-end=\"21473\">local cooling and temperature control<\/strong>.<\/p>\n<p dir=\"auto\" data-start=\"21476\" data-end=\"21557\">However, the absence of an AHU does <strong data-start=\"21512\" data-end=\"21519\">not<\/strong> mean that ventilation can be ignored.<\/p>\n<p dir=\"auto\" data-start=\"21559\" data-end=\"21609\"><strong>For commercial buildings, you may need a separate:<\/strong><\/p>\n<p dir=\"auto\" data-start=\"21611\" data-end=\"21657\"><strong data-start=\"21611\" data-end=\"21657\">FAHU \/ DOAS \/ Fresh-Air Ventilation System<\/strong><\/p>\n<p dir=\"auto\" data-start=\"21659\" data-end=\"21693\">to provide controlled outdoor air.<\/p>\n<p dir=\"auto\" data-start=\"21695\" data-end=\"21705\"><strong>Therefore:<\/strong><\/p>\n<blockquote data-start=\"21707\" data-end=\"21909\">\n<p dir=\"auto\" data-start=\"21709\" data-end=\"21909\"><strong data-start=\"21709\" data-end=\"21744\">FCU = local temperature control<\/strong><br data-start=\"21744\" data-end=\"21747\" \/><strong data-start=\"21749\" data-end=\"21800\">AHU = centralized air handling and distribution<\/strong><br data-start=\"21800\" data-end=\"21803\" \/><strong data-start=\"21805\" data-end=\"21842\">Chiller = source of chilled water<\/strong><br data-start=\"21842\" data-end=\"21845\" \/><strong data-start=\"21847\" data-end=\"21909\">FAHU\/DOAS = dedicated outdoor-air treatment where required<\/strong><\/p>\n<\/blockquote>\n<p dir=\"auto\" data-start=\"21911\" data-end=\"22079\">The best configuration should be selected after evaluating the <strong data-start=\"21974\" data-end=\"22078\">cooling load, ventilation requirement, zoning, building layout, energy objectives and project budget<\/strong>.<\/p>\n<p dir=\"auto\" data-start=\"22081\" data-end=\"22173\"><strong data-start=\"22081\" data-end=\"22173\">Planning an FCU, AHU or chilled-water HVAC system? Contact VIPUL HVAC Solution Pvt. Ltd.<\/strong><\/p>\n<p dir=\"auto\" data-start=\"22175\" data-end=\"22261\">\ud83d\udcde <strong data-start=\"22178\" data-end=\"22196\">+91 8000392000<\/strong><br data-start=\"22196\" data-end=\"22199\" \/>\ud83d\udce7 <strong data-start=\"22202\" data-end=\"22231\"><a class=\"decorated-link cursor-pointer\" rel=\"noopener\" data-start=\"22204\" data-end=\"22229\">info@vipulhvacsolution.in<\/a><\/strong><br data-start=\"22231\" data-end=\"22234\" \/>\ud83c\udf10 <a href=\"https:\/\/vipulhvacsolution.in\/\"><strong data-start=\"22237\" data-end=\"22261\">vipulhvacsolution.in<\/strong><\/a><\/p>\n<hr data-start=\"22263\" data-end=\"22266\" \/>\n<h3 dir=\"auto\" data-section-id=\"je53b\" data-start=\"22923\" data-end=\"22953\">Recommended Links:<\/h3>\n<ul data-start=\"23002\" data-end=\"23277\">\n<li data-section-id=\"1oa0jf0\" data-start=\"23002\" data-end=\"23028\"><a href=\"https:\/\/vipulhvacsolution.in\/fan-coil-units-fcu\/\"><strong data-start=\"23004\" data-end=\"23028\">Fan Coil Units (FCU)<\/strong><\/a><\/li>\n<li data-section-id=\"19lxot1\" data-start=\"23029\" data-end=\"23059\"><a href=\"https:\/\/vipulhvacsolution.in\/air-handling-units-ahu\/\"><strong data-start=\"23031\" data-end=\"23059\">Air Handling Units (AHU)<\/strong><\/a><\/li>\n<li data-section-id=\"86rvxo\" data-start=\"23060\" data-end=\"23087\"><a href=\"https:\/\/vipulhvacsolution.in\/blog\/ahu-supplier-in-india\/\"><strong data-start=\"23062\" data-end=\"23087\">AHU Supplier in India<\/strong><\/a><\/li>\n<li data-section-id=\"1kkc1pl\" data-start=\"23088\" data-end=\"23112\"><strong data-start=\"23090\" data-end=\"23112\">Air Cooled Chiller<\/strong><\/li>\n<li data-section-id=\"40ww12\" data-start=\"23113\" data-end=\"23139\"><a href=\"https:\/\/vipulhvacsolution.in\/chiller-systems\/\"><strong data-start=\"23115\" data-end=\"23139\">Water Cooled Chiller<\/strong><\/a><\/li>\n<li data-section-id=\"1a1zxi4\" data-start=\"23140\" data-end=\"23193\"><strong data-start=\"23142\" data-end=\"23193\">Chiller System Supplier &amp; Contractor in Gujarat<\/strong><\/li>\n<li data-section-id=\"1is9u98\" data-start=\"23194\" data-end=\"23228\"><strong data-start=\"23196\" data-end=\"23228\">Fresh Air Ventilation System<\/strong><\/li>\n<li data-section-id=\"ivndei\" data-start=\"23229\" data-end=\"23249\"><strong data-start=\"23231\" data-end=\"23249\">VRF vs Chiller<\/strong><\/li>\n<li data-section-id=\"1jp6ub5\" data-start=\"23250\" data-end=\"23277\"><a href=\"https:\/\/vipulhvacsolution.in\/bms-hvac-automation\/\"><strong data-start=\"23252\" data-end=\"23277\">BMS &amp; HVAC Automation<\/strong><\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Can FCU Work Without AHU? Complete HVAC Guide Yes, an FCU (Fan Coil Unit) can work without an AHU (Air Handling Unit). An FCU is a separate HVAC terminal that can condition air for an individual room or zone. It does not inherently require an AHU to operate. However, there is an important distinction: An [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":422,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10,12],"tags":[],"class_list":["post-419","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ahu","category-fcu"],"_links":{"self":[{"href":"https:\/\/vipulhvacsolution.in\/blog\/wp-json\/wp\/v2\/posts\/419","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vipulhvacsolution.in\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vipulhvacsolution.in\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vipulhvacsolution.in\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/vipulhvacsolution.in\/blog\/wp-json\/wp\/v2\/comments?post=419"}],"version-history":[{"count":4,"href":"https:\/\/vipulhvacsolution.in\/blog\/wp-json\/wp\/v2\/posts\/419\/revisions"}],"predecessor-version":[{"id":424,"href":"https:\/\/vipulhvacsolution.in\/blog\/wp-json\/wp\/v2\/posts\/419\/revisions\/424"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vipulhvacsolution.in\/blog\/wp-json\/wp\/v2\/media\/422"}],"wp:attachment":[{"href":"https:\/\/vipulhvacsolution.in\/blog\/wp-json\/wp\/v2\/media?parent=419"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vipulhvacsolution.in\/blog\/wp-json\/wp\/v2\/categories?post=419"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vipulhvacsolution.in\/blog\/wp-json\/wp\/v2\/tags?post=419"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}