{"id":813,"date":"2026-10-06T07:16:53","date_gmt":"2026-10-06T07:16:53","guid":{"rendered":"https:\/\/vipulhvacsolution.in\/blog\/?p=813"},"modified":"2026-10-06T08:02:53","modified_gmt":"2026-10-06T08:02:53","slug":"100-fresh-air-ahu","status":"publish","type":"post","link":"https:\/\/vipulhvacsolution.in\/blog\/100-fresh-air-ahu\/","title":{"rendered":"100% Fresh Air 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\/100-fresh-air-ahu\/#100_Fresh_Air_AHU_Working_Principle_Applications_Benefits\" >100% Fresh Air AHU: Working Principle, Applications &amp; Benefits<\/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\/100-fresh-air-ahu\/#What_Is_a_100_Fresh_Air_AHU\" >What Is a 100% Fresh Air AHU?<\/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\/100-fresh-air-ahu\/#Important_What_Does_%E2%80%9C100_Fresh_Air%E2%80%9D_Actually_Mean\" >Important: What Does &#8220;100% Fresh Air&#8221; Actually Mean?<\/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\/100-fresh-air-ahu\/#100_Fresh_Air_AHU_Working_Principle\" >100% Fresh Air AHU Working Principle<\/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\/100-fresh-air-ahu\/#100_Fresh_Air_AHU_vs_Conventional_AHU\" >100% Fresh Air AHU vs Conventional AHU<\/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\/100-fresh-air-ahu\/#7_Major_Benefits_of_a_100_Fresh_Air_AHU\" >7 Major Benefits of a 100% Fresh Air 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\/100-fresh-air-ahu\/#Applications_of_100_Fresh_Air_AHU\" >Applications of 100% Fresh Air AHU<\/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\/100-fresh-air-ahu\/#100_Fresh_Air_AHU_Design_Parameters\" >100% Fresh Air AHU Design Parameters<\/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\/100-fresh-air-ahu\/#Energy_Efficiency_of_100_Fresh_Air_AHU\" >Energy Efficiency of 100% Fresh Air 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\/100-fresh-air-ahu\/#Heat_Recovery_with_100_Fresh_Air_AHU\" >Heat Recovery with 100% Fresh Air 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\/100-fresh-air-ahu\/#100_Fresh_Air_AHU_for_Industrial_HVAC\" >100% Fresh Air AHU for Industrial HVAC<\/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\/100-fresh-air-ahu\/#Fresh_Air_AHU_Filtration_Design\" >Fresh Air AHU Filtration Design<\/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\/100-fresh-air-ahu\/#100_Fresh_Air_AHU_Maintenance\" >100% Fresh Air AHU Maintenance<\/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\/100-fresh-air-ahu\/#How_to_Select_a_100_Fresh_Air_AHU_Supplier\" >How to Select a 100% Fresh Air AHU Supplier<\/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\/100-fresh-air-ahu\/#Why_Choose_VIPUL_HVAC_SOLUTION_PVT_LTD\" >Why Choose VIPUL HVAC SOLUTION PVT. LTD.?<\/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\/100-fresh-air-ahu\/#100_Fresh_Air_AHU_Cost\" >100% Fresh Air AHU Cost<\/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\/100-fresh-air-ahu\/#Information_Required_for_a_100_Fresh_Air_AHU_Quotation\" >Information Required for a 100% Fresh Air AHU Quotation<\/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\/100-fresh-air-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-19\" href=\"https:\/\/vipulhvacsolution.in\/blog\/100-fresh-air-ahu\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"100_Fresh_Air_AHU_Working_Principle_Applications_Benefits\"><\/span>100% Fresh Air AHU: Working Principle, Applications &amp; Benefits<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A <strong>100% Fresh Air AHU<\/strong> is an air-handling system designed to supply conditioned outdoor air without intentionally mixing return air into the supply-air stream. It is also commonly described as a <strong>100% Outdoor Air AHU<\/strong>, <strong>Fresh Air Handling Unit (FAHU)<\/strong> or, depending on the project, a <strong>Treated Fresh Air Unit (TFA)<\/strong>.<\/p>\n<p><strong>The basic concept is:<\/strong><\/p>\n<p><strong>100% Outdoor Air \u2192 Filtration \u2192 Cooling\/Heating \u2192 Humidity Treatment \u2192 Fan \u2192 Supply Duct \u2192 Conditioned Space<\/strong><\/p>\n<p>Unlike a conventional mixed-air AHU, which may combine return air with outdoor air, a 100% fresh-air system is designed around outdoor-air treatment. ASHRAE describes outdoor air as air brought intentionally into a building from the environment and distinguishes it from return and recirculated air. <a href=\"https:\/\/handbook.ashrae.org\/Handbooks\/F25\/SI\/F25_Ch16\/F25_Ch16_si.aspx\" target=\"_blank\" rel=\"noopener\">ASHRAE Handbook Online<\/a><\/p>\n<p>For commercial, industrial, pharmaceutical, healthcare and specialized HVAC applications, the correct design must consider ventilation requirements, outdoor-air quality, filtration, cooling load, humidity, exhaust\/relief air, building pressure and energy consumption.<\/p>\n<p><strong>VIPUL HVAC SOLUTION PVT. LTD.<\/strong> provides customized AHU solutions including treated fresh-air handling units, filtration, cooling\/heating coils, fan configurations, controls, duct and air-distribution design, installation, commissioning and maintenance. <a href=\"https:\/\/vipulhvacsolution.in\/blog\/ahu-supplier-in-india\/\">Vipulhvac Solution<\/a><\/p>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"What_Is_a_100_Fresh_Air_AHU\"><\/span>What Is a 100% Fresh Air AHU?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A <strong>100% Fresh Air AHU<\/strong> is an AHU in which the designed supply-air stream consists of outdoor air rather than a mixture of outdoor and return air.<\/p>\n<p><strong>In simple terms:<\/strong><\/p>\n<blockquote><p><strong>100% Fresh Air AHU = Outdoor Air as the Supply-Air Source<\/strong><\/p><\/blockquote>\n<p>The unit receives outdoor air, filters it, conditions it and supplies it to the required area.<\/p>\n<p><strong>A typical unit may contain:<\/strong><\/p>\n<ul>\n<li>Fresh-air intake<\/li>\n<li>Intake damper<\/li>\n<li>Pre-filter<\/li>\n<li>Fine filter<\/li>\n<li>HEPA filter where required<\/li>\n<li>Cooling coil<\/li>\n<li>Heating coil where required<\/li>\n<li>Supply fan<\/li>\n<li>EC or backward-curved fan<\/li>\n<li>Humidity-control provisions<\/li>\n<li>Drain pan<\/li>\n<li>Sensors<\/li>\n<li>VFD<\/li>\n<li>Control panel<\/li>\n<li>BMS interface<\/li>\n<\/ul>\n<p>The exact configuration depends on the application and engineering requirements. VIPUL HVAC&#8217;s published <a href=\"https:\/\/vipulac.in\/air-handling-unit\/\" target=\"_blank\" rel=\"noopener\">AHU<\/a> specifications include custom CFM, single- and double-skin construction, pre\/fine\/HEPA filtration, cooling\/heating coils, backward-curved and EC fans, acoustic insulation, BMS-ready controls and treated fresh-air units. <a href=\"https:\/\/vipulhvacsolution.in\/blog\/ahu-supplier-in-india\/\">Vipulhvac Solution<\/a><\/p>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"Important_What_Does_%E2%80%9C100_Fresh_Air%E2%80%9D_Actually_Mean\"><\/span>Important: What Does &#8220;100% Fresh Air&#8221; Actually Mean?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The term <strong>100% fresh air<\/strong> refers primarily to the <strong>air source for the supply stream<\/strong>.<\/p>\n<p>It does <strong>not<\/strong> mean that the building operates without exhaust, return-air pathways or pressure-control systems.<\/p>\n<p>A properly designed system normally needs a corresponding strategy for removing or relieving air from the conditioned space.<\/p>\n<p><strong>For example:<\/strong><\/p>\n<p><strong>Outdoor Air \u2192 100% Fresh Air AHU \u2192 Supply Space \u2192 Exhaust\/Relief \u2192 Outdoor<\/strong><\/p>\n<p>This is particularly important in industrial applications where contaminants, heat, moisture or process emissions must be removed.<\/p>\n<p>The outdoor-air intake and exhaust arrangement also needs careful design so that contaminated exhaust does not get drawn back into the fresh-air intake. ASHRAE&#8217;s ventilation guidance includes requirements concerning outdoor-air intakes, exhaust locations and separation from potential contaminant sources. <a href=\"https:\/\/www.ashrae.org\/file%20library\/technical%20resources\/standards%20and%20guidelines\/standards%20addenda\/62_1_2022_ag_20240430.pdf\" target=\"_blank\" rel=\"noopener\">ASHRAE<\/a><\/p>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"100_Fresh_Air_AHU_Working_Principle\"><\/span>100% Fresh Air AHU Working Principle<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The working principle can be explained in seven major stages.<\/p>\n<h3>1. Outdoor Air Intake<\/h3>\n<p>The system draws air from outside through a properly positioned intake.<\/p>\n<p><strong>The intake should be located away from:<\/strong><\/p>\n<ul>\n<li>Exhaust outlets<\/li>\n<li>Vehicle emissions<\/li>\n<li>Industrial emissions<\/li>\n<li>Dust sources<\/li>\n<li>Cooling-tower discharge<\/li>\n<li>Other potential contaminant sources<\/li>\n<\/ul>\n<p>Outdoor-air quality is an important part of ventilation design.<\/p>\n<hr \/>\n<h3>2. Pre-Filtration<\/h3>\n<p>The incoming air first passes through a pre-filter.<\/p>\n<p>The pre-filter can capture larger airborne particles and help protect downstream components.<\/p>\n<p>This can reduce the particulate load reaching the finer filtration stages and cooling coil.<\/p>\n<hr \/>\n<h3>3. Fine Filtration<\/h3>\n<p>The air can then pass through a finer filtration stage.<\/p>\n<p><strong>The required filtration level depends on:<\/strong><\/p>\n<ul>\n<li>Application<\/li>\n<li>Outdoor-air quality<\/li>\n<li>Indoor-air-quality objectives<\/li>\n<li>Process requirements<\/li>\n<li>Applicable standards<\/li>\n<\/ul>\n<p>For specialized environments, additional high-efficiency filtration may be specified.<\/p>\n<hr \/>\n<h3>4. HEPA Filtration Where Required<\/h3>\n<p>HEPA filtration can be included when the application requires high-efficiency particulate filtration.<\/p>\n<p><strong>It may be considered for applications such as:<\/strong><\/p>\n<ul>\n<li>Pharmaceutical facilities<\/li>\n<li>Cleanrooms<\/li>\n<li>Certain healthcare areas<\/li>\n<li>Laboratories<\/li>\n<li>Specialized manufacturing<\/li>\n<\/ul>\n<p>However, <strong>HEPA filtration should not automatically be specified for every 100% fresh-air AHU<\/strong>. It adds pressure drop and energy requirements, so the filtration stage should be selected according to the actual application.<\/p>\n<p>VIPUL HVAC publishes AHU configurations with pre-, fine- and HEPA-filtration options. <a href=\"https:\/\/vipulhvacsolution.in\/blog\/ahu-supplier-in-india\/\">Vipulhvac Solution<\/a><\/p>\n<hr \/>\n<h3>5. Cooling or Heating<\/h3>\n<p>After filtration, the outdoor air may pass through a cooling or heating coil.<\/p>\n<p>In India&#8217;s climate, cooling and dehumidification are often important because outdoor air can contain both high temperature and moisture.<\/p>\n<p><strong>A chilled-water system may operate as:<\/strong><\/p>\n<p><strong>Chiller \u2192 Chilled Water \u2192 AHU Cooling Coil \u2192 Conditioned Fresh Air<\/strong><\/p>\n<p>A DX-based system can instead use refrigerant directly through the cooling coil.<\/p>\n<p>The selection depends on the project design.<\/p>\n<hr \/>\n<h3>6. Fan Section<\/h3>\n<p>The supply fan moves the treated outdoor air through the AHU and duct system.<\/p>\n<p><strong>Fan selection depends on:<\/strong><\/p>\n<ul>\n<li>CFM<\/li>\n<li>Static pressure<\/li>\n<li>Filter pressure drop<\/li>\n<li>Coil pressure drop<\/li>\n<li>Duct resistance<\/li>\n<li>Terminal-device resistance<\/li>\n<li>Efficiency<\/li>\n<li>Operating schedule<\/li>\n<\/ul>\n<p>VIPUL HVAC lists backward-curved and EC fan options for its AHU solutions. <a href=\"https:\/\/vipulhvacsolution.in\/air-handling-units-ahu\/\">Vipulhvac Solution<\/a><\/p>\n<hr \/>\n<h3>7. Conditioned Fresh Air to the Building<\/h3>\n<p>Finally, the treated air travels through the supply ductwork to the required areas.<\/p>\n<p><strong>The system can be connected to:<\/strong><\/p>\n<ul>\n<li>Supply-air ducts<\/li>\n<li>Diffusers<\/li>\n<li>Grilles<\/li>\n<li>VAV systems<\/li>\n<li>FCUs<\/li>\n<li>AHUs<\/li>\n<li>Process areas<\/li>\n<li>Cleanrooms<\/li>\n<\/ul>\n<p>The complete ventilation strategy should be designed so that the supply and exhaust\/relief quantities support the required building pressure.<\/p>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"100_Fresh_Air_AHU_vs_Conventional_AHU\"><\/span>100% Fresh Air AHU vs Conventional AHU<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div>\n<div>\n<div>\n<table style=\"height: 374px;\" width=\"974\">\n<thead>\n<tr>\n<th>Feature<\/th>\n<th>100% Fresh Air AHU<\/th>\n<th>Conventional Mixed-Air AHU<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Main air source<\/td>\n<td>Outdoor air<\/td>\n<td>Outdoor + return air<\/td>\n<\/tr>\n<tr>\n<td>Return-air mixing<\/td>\n<td>Normally not used in supply stream<\/td>\n<td>Common<\/td>\n<\/tr>\n<tr>\n<td>Fresh-air treatment<\/td>\n<td>Primary function<\/td>\n<td>Part of overall design<\/td>\n<\/tr>\n<tr>\n<td>Filtration<\/td>\n<td>Important<\/td>\n<td>Important<\/td>\n<\/tr>\n<tr>\n<td>Cooling load<\/td>\n<td>Higher outdoor-air load<\/td>\n<td>Lower outdoor-air load<\/td>\n<\/tr>\n<tr>\n<td>Dehumidification<\/td>\n<td>Often significant<\/td>\n<td>Application dependent<\/td>\n<\/tr>\n<tr>\n<td>Exhaust\/relief strategy<\/td>\n<td>Very important<\/td>\n<td>Application dependent<\/td>\n<\/tr>\n<tr>\n<td>Energy consumption<\/td>\n<td>Can be higher<\/td>\n<td>Can be lower<\/td>\n<\/tr>\n<tr>\n<td>Heat recovery<\/td>\n<td>Highly useful where suitable<\/td>\n<td>May be used<\/td>\n<\/tr>\n<tr>\n<td>Contaminant dilution<\/td>\n<td>Strong potential benefit<\/td>\n<td>Depends on ventilation rate<\/td>\n<\/tr>\n<tr>\n<td>Industrial applications<\/td>\n<td>Excellent for specific processes<\/td>\n<td>Widely used<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<p>A 100% outdoor-air design can provide strong ventilation control, but it may require more energy because all supplied outdoor air must be conditioned.<\/p>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"7_Major_Benefits_of_a_100_Fresh_Air_AHU\"><\/span>7 Major Benefits of a 100% Fresh Air AHU<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3>1. Controlled Outdoor-Air Supply<\/h3>\n<p>A dedicated system provides a predictable source of outdoor air instead of relying on uncontrolled infiltration.<\/p>\n<p>ASHRAE Standard 62.1-2025 addresses ventilation and acceptable indoor air quality and includes requirements related to ventilation, filtration, controls, air cleaning, commissioning and operation and maintenance. <a href=\"https:\/\/www.ashrae.org\/technical-resources\/standards-and-guidelines\/titles-purposes-and-scopes\" target=\"_blank\" rel=\"noopener\">ASHRAE<\/a><\/p>\n<hr \/>\n<h3>2. Better Ventilation Control<\/h3>\n<p><strong>A properly engineered system allows HVAC engineers to control:<\/strong><\/p>\n<ul>\n<li>Fresh-air CFM<\/li>\n<li>Supply-air temperature<\/li>\n<li>Filtration<\/li>\n<li>Pressure<\/li>\n<li>Exhaust<\/li>\n<li>Humidity<\/li>\n<li>Operating schedules<\/li>\n<\/ul>\n<p>This is especially valuable in industrial and specialized applications.<\/p>\n<hr \/>\n<h3>3. Helps Dilute Indoor Contaminants<\/h3>\n<p>Introducing outdoor air and exhausting indoor air can help control contaminant concentrations when the system is correctly designed and operated.<\/p>\n<p>However, ventilation alone does not guarantee acceptable indoor air quality. ASHRAE notes that IAQ depends on several factors, including outdoor-air quality, contaminant sources and system operation and maintenance. <a href=\"https:\/\/www.ashrae.org\/technical-resources\/standards-and-guidelines\/titles-purposes-and-scopes\" target=\"_blank\" rel=\"noopener\">ASHRAE<\/a><\/p>\n<hr \/>\n<h3>4. Reduced Dependence on Recirculated Air<\/h3>\n<p>For applications where recirculation is undesirable or restricted by the process, a 100% outdoor-air design can be advantageous.<\/p>\n<p><strong>Examples may include areas with:<\/strong><\/p>\n<ul>\n<li>Strong odors<\/li>\n<li>Certain process contaminants<\/li>\n<li>High moisture loads<\/li>\n<li>Specific hygiene requirements<\/li>\n<li>Specialized industrial processes<\/li>\n<\/ul>\n<p>The exact suitability should be determined by an HVAC engineer.<\/p>\n<hr \/>\n<h3>5. Improved Process Ventilation<\/h3>\n<p>Industrial processes may require a controlled supply of treated outdoor air while contaminated or heated air is exhausted.<\/p>\n<p>A 100% Fresh Air AHU can therefore work as part of an integrated:<\/p>\n<p><strong>Supply + Exhaust + Pressure-Control System<\/strong><\/p>\n<hr \/>\n<h3>6. Flexible Filtration<\/h3>\n<p>The AHU can be designed with multiple filtration stages according to the application.<\/p>\n<p><strong>Possible arrangements include:<\/strong><\/p>\n<p><strong>Pre-Filter \u2192 Fine Filter \u2192 HEPA Filter<\/strong><\/p>\n<p>Not every project requires all three stages.<\/p>\n<hr \/>\n<h3>7. Integration with Modern Controls<\/h3>\n<p><strong>A 100% Fresh Air AHU can be integrated with:<\/strong><\/p>\n<ul>\n<li>Temperature sensors<\/li>\n<li>Humidity sensors<\/li>\n<li>Pressure sensors<\/li>\n<li>Differential-pressure monitoring<\/li>\n<li>VFD<\/li>\n<li>Motor controls<\/li>\n<li>Dampers<\/li>\n<li>BMS<\/li>\n<li>Alarm systems<\/li>\n<\/ul>\n<p>This allows facility operators to monitor system performance and optimize operation.<\/p>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"Applications_of_100_Fresh_Air_AHU\"><\/span>Applications of 100% Fresh Air AHU<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3>1. Pharmaceutical Industry<\/h3>\n<p><strong>Pharmaceutical manufacturing may require controlled:<\/strong><\/p>\n<ul>\n<li>Temperature<\/li>\n<li>Humidity<\/li>\n<li>Filtration<\/li>\n<li>Pressure<\/li>\n<li>Air changes<\/li>\n<li>Fresh-air supply<\/li>\n<\/ul>\n<p>A 100% fresh-air system may be used where the process or ventilation strategy requires dedicated outdoor-air treatment.<\/p>\n<p>The final design should follow the project&#8217;s applicable GMP, cleanroom and HVAC requirements.<\/p>\n<hr \/>\n<h3>2. Cleanrooms<\/h3>\n<p>Cleanrooms require carefully controlled environmental conditions.<\/p>\n<p><strong>A Fresh Air AHU can support:<\/strong><\/p>\n<ul>\n<li>Outdoor-air treatment<\/li>\n<li>Filtration<\/li>\n<li>Temperature control<\/li>\n<li>Humidity control<\/li>\n<li>Pressure control<\/li>\n<li>Air-change management<\/li>\n<\/ul>\n<p>HEPA filtration and terminal filtration may be incorporated depending on the cleanroom design.<\/p>\n<hr \/>\n<h3>3. Hospitals<\/h3>\n<p>Healthcare applications can have different ventilation requirements depending on the room.<\/p>\n<p><strong>Potential applications include:<\/strong><\/p>\n<ul>\n<li>Isolation areas<\/li>\n<li>Operating areas<\/li>\n<li>Laboratories<\/li>\n<li>Patient-care areas<\/li>\n<li>General hospital areas<\/li>\n<\/ul>\n<p>Healthcare HVAC should be designed according to the specific room function and applicable healthcare ventilation standards.<\/p>\n<hr \/>\n<h3>4. Chemical Industries<\/h3>\n<p><strong>Chemical facilities may require specialized ventilation because of:<\/strong><\/p>\n<ul>\n<li>Process emissions<\/li>\n<li>Odors<\/li>\n<li>Heat<\/li>\n<li>Chemical vapors<\/li>\n<li>Humidity<\/li>\n<li>Contamination risks<\/li>\n<\/ul>\n<p>A 100% fresh-air AHU can be part of the ventilation strategy, but it must be coordinated with appropriate local exhaust and process-safety systems.<\/p>\n<hr \/>\n<h3>5. Manufacturing Plants<\/h3>\n<p><strong>Manufacturing facilities can use 100% Fresh Air AHUs for:<\/strong><\/p>\n<ul>\n<li>Production areas<\/li>\n<li>Process areas<\/li>\n<li>Assembly areas<\/li>\n<li>Packaging areas<\/li>\n<li>Utility areas<\/li>\n<li>Worker areas<\/li>\n<\/ul>\n<p>The design should consider process heat, dust, pollutants and operating schedules.<\/p>\n<hr \/>\n<h3>6. Food Processing Plants<\/h3>\n<p>Food-processing environments can require controlled ventilation and environmental conditions.<\/p>\n<p><strong>A Fresh Air AHU can provide:<\/strong><\/p>\n<ul>\n<li>Filtered outdoor air<\/li>\n<li>Temperature control<\/li>\n<li>Humidity control<\/li>\n<li>Controlled ventilation<\/li>\n<li>Positive or negative pressure support where appropriate<\/li>\n<\/ul>\n<hr \/>\n<h3>7. Textile Industries<\/h3>\n<p><strong>Textile manufacturing can have specific requirements for:<\/strong><\/p>\n<ul>\n<li>Temperature<\/li>\n<li>Relative humidity<\/li>\n<li>Airflow<\/li>\n<li>Dust control<\/li>\n<\/ul>\n<p>Fresh-air treatment can be integrated into the overall textile HVAC system according to the production process.<\/p>\n<hr \/>\n<h3>8. Laboratories<\/h3>\n<p>Laboratories may require high ventilation rates and dedicated exhaust systems.<\/p>\n<p>A 100% outdoor-air AHU can be considered for supplying conditioned air while exhaust systems remove contaminated air.<\/p>\n<p>For laboratories using hazardous materials, the ventilation design must be based on the specific process and safety requirements.<\/p>\n<hr \/>\n<h3>9. Commercial Buildings<\/h3>\n<p><strong>100% Fresh Air AHUs can also be used in:<\/strong><\/p>\n<ul>\n<li>Offices<\/li>\n<li>Shopping malls<\/li>\n<li>Hotels<\/li>\n<li>Corporate buildings<\/li>\n<li>Educational facilities<\/li>\n<li>Large commercial spaces<\/li>\n<\/ul>\n<p>However, a 100% outdoor-air design is not automatically the most energy-efficient solution for every commercial building.<\/p>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"100_Fresh_Air_AHU_Design_Parameters\"><\/span>100% Fresh Air AHU Design Parameters<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>Before selecting the equipment, an HVAC engineer should evaluate:<\/strong><\/p>\n<h3>Outdoor Airflow<\/h3>\n<p>Required fresh-air CFM or m\u00b3\/h.<\/p>\n<h3>Indoor Design Condition<\/h3>\n<p><strong>Required:<\/strong><\/p>\n<ul>\n<li>Temperature<\/li>\n<li>Relative humidity<\/li>\n<li>Pressure<\/li>\n<\/ul>\n<h3>Outdoor Design Condition<\/h3>\n<p><strong>Outdoor:<\/strong><\/p>\n<ul>\n<li>Dry-bulb temperature<\/li>\n<li>Wet-bulb temperature<\/li>\n<li>Humidity<\/li>\n<li>Air quality<\/li>\n<\/ul>\n<h3>Cooling Load<\/h3>\n<p>Because all supply air is outdoor air, the cooling and dehumidification load can be significant.<\/p>\n<h3>Filtration<\/h3>\n<p>Determine the required filtration stages and efficiency.<\/p>\n<h3>Static Pressure<\/h3>\n<p><strong>Calculate pressure losses through:<\/strong><\/p>\n<ul>\n<li>Filters<\/li>\n<li>Coils<\/li>\n<li>AHU casing<\/li>\n<li>Ducts<\/li>\n<li>Dampers<\/li>\n<li>Diffusers<\/li>\n<li>Other components<\/li>\n<\/ul>\n<h3>Exhaust Air<\/h3>\n<p>A 100% outdoor-air system needs an appropriate exhaust or relief strategy.<\/p>\n<h3>Heat Recovery<\/h3>\n<p>Where suitable, heat or energy recovery can reduce the energy penalty associated with conditioning outdoor air.<\/p>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"Energy_Efficiency_of_100_Fresh_Air_AHU\"><\/span>Energy Efficiency of 100% Fresh Air AHU<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>One of the biggest challenges of 100% outdoor-air systems is energy consumption.<\/p>\n<p>When outdoor air is hot and humid, the AHU must remove substantial sensible and latent heat before the air reaches the required supply condition.<\/p>\n<p><strong>Energy efficiency can be improved through:<\/strong><\/p>\n<ul>\n<li>High-efficiency fans<\/li>\n<li>EC motors<\/li>\n<li>VFD control<\/li>\n<li>Correct duct sizing<\/li>\n<li>Low-pressure-drop filters<\/li>\n<li>Efficient coils<\/li>\n<li>Heat recovery<\/li>\n<li>Energy recovery<\/li>\n<li>Proper control sequences<\/li>\n<li>Demand-based operation where applicable<\/li>\n<li>Regular filter maintenance<\/li>\n<\/ul>\n<p>ASHRAE&#8217;s current ventilation guidance includes energy and ventilation considerations, while its 2025 Standard 62.1 includes updated requirements related to humidity control, demand-controlled ventilation and filtration. <a href=\"https:\/\/www.ashrae.org\/technical-resources\/bookstore\/standards-62-1-62-2\" target=\"_blank\" rel=\"noopener\">ASHRAE<\/a><\/p>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"Heat_Recovery_with_100_Fresh_Air_AHU\"><\/span>Heat Recovery with 100% Fresh Air AHU<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Heat or energy recovery can be especially useful when a facility continuously exhausts conditioned indoor air.<\/p>\n<p><strong>A simplified arrangement is:<\/strong><\/p>\n<p><strong>Outdoor Air \u2192 Energy Recovery \u2192 AHU \u2192 Building<\/strong><\/p>\n<p><strong>and:<\/strong><\/p>\n<p><strong>Building Exhaust \u2192 Energy Recovery \u2192 Outdoor<\/strong><\/p>\n<p>The energy exchanger transfers thermal energy between the exhaust and incoming outdoor air without intentionally mixing the two air streams.<\/p>\n<p>The suitability of a heat-recovery system depends on the application, contamination risk and equipment design.<\/p>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"100_Fresh_Air_AHU_for_Industrial_HVAC\"><\/span>100% Fresh Air AHU for Industrial HVAC<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Industrial applications often have more complex ventilation requirements than standard comfort cooling.<\/p>\n<p><strong>A complete industrial HVAC strategy may include:<\/strong><\/p>\n<p><strong>Fresh Air AHU + Supply Duct + Process Area + Local Exhaust + General Exhaust + Pressure Control + Controls<\/strong><\/p>\n<p>For example, in a chemical facility, the Fresh Air AHU may supply conditioned outdoor air while dedicated exhaust systems remove process contaminants.<\/p>\n<p>This is why the AHU should be designed as part of the <strong>complete HVAC and ventilation system<\/strong>, not as an isolated piece of equipment.<\/p>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"Fresh_Air_AHU_Filtration_Design\"><\/span>Fresh Air AHU Filtration Design<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Filtration should be selected according to the application.<\/p>\n<h3>Stage 1: Pre-Filtration<\/h3>\n<p>Protects downstream components from larger particles.<\/p>\n<h3>Stage 2: Fine Filtration<\/h3>\n<p>Provides higher particulate filtration.<\/p>\n<h3>Stage 3: HEPA Filtration<\/h3>\n<p>Used where high-efficiency particulate filtration is required.<\/p>\n<h3>Filter Monitoring<\/h3>\n<p>Differential-pressure monitoring can be used to identify increasing filter resistance.<\/p>\n<p>A filter that becomes excessively loaded can increase system pressure drop and fan energy requirements.<\/p>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"100_Fresh_Air_AHU_Maintenance\"><\/span>100% Fresh Air AHU Maintenance<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Regular maintenance is essential.<\/p>\n<p><strong>A preventive maintenance program should include:<\/strong><\/p>\n<ul>\n<li>Pre-filter inspection<\/li>\n<li>Fine-filter inspection<\/li>\n<li>HEPA-filter inspection where installed<\/li>\n<li>Filter pressure-drop monitoring<\/li>\n<li>Cooling-coil cleaning<\/li>\n<li>Fan inspection<\/li>\n<li>Motor inspection<\/li>\n<li>Bearing inspection<\/li>\n<li>Belt inspection where applicable<\/li>\n<li>Drain-pan cleaning<\/li>\n<li>Drain-line inspection<\/li>\n<li>Damper inspection<\/li>\n<li>Sensor checking<\/li>\n<li>Control-panel inspection<\/li>\n<li>VFD inspection<\/li>\n<li>Airflow measurement<\/li>\n<li>Static-pressure measurement<\/li>\n<li>Duct inspection<\/li>\n<\/ul>\n<p>VIPUL HVAC&#8217;s published AHU guidance also recommends maintenance planning covering filters, coils, fans, drains, dampers and related components. <a href=\"https:\/\/vipulhvacsolution.in\/blog\/ahu-supplier-in-india\/\">Vipulhvac Solution<\/a><\/p>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"How_to_Select_a_100_Fresh_Air_AHU_Supplier\"><\/span>How to Select a 100% Fresh Air AHU Supplier<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>Before purchasing a Fresh Air AHU, evaluate the supplier&#8217;s ability to provide:<\/strong><\/p>\n<h3>1. HVAC Design<\/h3>\n<p>Can the supplier calculate airflow and cooling requirements?<\/p>\n<h3>2. AHU Customization<\/h3>\n<p>Can the equipment be customized according to CFM, filtration and pressure requirements?<\/p>\n<h3>3. Filtration<\/h3>\n<p>Can the supplier provide the required filtration configuration?<\/p>\n<h3>4. Duct Design<\/h3>\n<p>Can supply and exhaust ductwork be properly engineered?<\/p>\n<h3>5. Installation<\/h3>\n<p>Does the supplier provide complete installation?<\/p>\n<h3>6. Testing &amp; Commissioning<\/h3>\n<p>Can airflow, pressure and temperature be tested after installation?<\/p>\n<h3>7. Maintenance<\/h3>\n<p>Does the supplier provide AMC and preventive maintenance?<\/p>\n<p>VIPUL HVAC&#8217;s published AHU project approach covers selection, customization, duct and air-distribution design, installation, testing, commissioning and maintenance. <a href=\"https:\/\/vipulhvacsolution.in\/blog\/ahu-supplier-in-india\/\">Vipulhvac Solution<\/a><\/p>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"Why_Choose_VIPUL_HVAC_SOLUTION_PVT_LTD\"><\/span>Why Choose VIPUL HVAC SOLUTION PVT. LTD.?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>VIPUL HVAC SOLUTION PVT. LTD.<\/strong> provides customized AHU and complete HVAC solutions for industrial, commercial and institutional applications.<\/p>\n<p><strong>For 100% Fresh Air AHU projects, the company can support:<\/strong><\/p>\n<ul>\n<li>Fresh-air AHU selection<\/li>\n<li>Custom CFM requirements<\/li>\n<li>AHU engineering<\/li>\n<li>Pre\/fine\/HEPA filtration<\/li>\n<li>Cooling coils<\/li>\n<li>Heating coils<\/li>\n<li>EC fans<\/li>\n<li>Backward-curved fans<\/li>\n<li>Treated fresh-air units<\/li>\n<li>Duct and air-distribution design<\/li>\n<li>HVAC controls<\/li>\n<li>BMS-ready systems<\/li>\n<li>Installation<\/li>\n<li>Testing<\/li>\n<li>Commissioning<\/li>\n<li>Preventive maintenance<\/li>\n<li>AMC<\/li>\n<\/ul>\n<p>These capabilities are reflected in VIPUL HVAC&#8217;s published AHU specifications and service information. <a href=\"https:\/\/vipulhvacsolution.in\/blog\/ahu-supplier-in-india\/\">Vipulhvac Solution<\/a><\/p>\n<h3>Complete HVAC Project Approach<\/h3>\n<p><strong>Site Survey \u2192 Fresh-Air Calculation \u2192 Cooling Load \u2192 AHU Selection \u2192 Filtration Design \u2192 Equipment Supply \u2192 Ductwork \u2192 Installation \u2192 Testing \u2192 Air Balancing \u2192 Commissioning \u2192 AMC<\/strong><\/p>\n<p>This approach helps ensure that the 100% Fresh Air AHU works as part of the complete ventilation system.<\/p>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"100_Fresh_Air_AHU_Cost\"><\/span>100% Fresh Air AHU Cost<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>There is <strong>no standard fixed price<\/strong> for a 100% Fresh Air AHU.<\/p>\n<p><strong>The final project cost depends on:<\/strong><\/p>\n<ul>\n<li>CFM<\/li>\n<li>Cooling capacity<\/li>\n<li>Heating capacity<\/li>\n<li>AHU casing<\/li>\n<li>Number of filtration stages<\/li>\n<li>HEPA filtration<\/li>\n<li>Fan type<\/li>\n<li>Motor<\/li>\n<li>Static pressure<\/li>\n<li>Coil specification<\/li>\n<li>Controls<\/li>\n<li>VFD<\/li>\n<li>BMS<\/li>\n<li>Heat recovery<\/li>\n<li>Ductwork<\/li>\n<li>Piping<\/li>\n<li>Installation<\/li>\n<li>Testing<\/li>\n<li>Commissioning<\/li>\n<li>AMC<\/li>\n<\/ul>\n<p>Therefore, a technical specification should be prepared before comparing quotations.<\/p>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"Information_Required_for_a_100_Fresh_Air_AHU_Quotation\"><\/span>Information Required for a 100% Fresh Air AHU Quotation<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>For a project-specific quotation, provide:<\/strong><\/p>\n<ol start=\"1\">\n<li>Project location<\/li>\n<li>Application<\/li>\n<li>Required CFM<\/li>\n<li>Room area<\/li>\n<li>Room height<\/li>\n<li>Occupancy<\/li>\n<li>Indoor temperature<\/li>\n<li>Indoor humidity<\/li>\n<li>Outdoor design conditions<\/li>\n<li>Required filtration<\/li>\n<li>Cooling requirement<\/li>\n<li>Heating requirement<\/li>\n<li>Static pressure<\/li>\n<li>Supply duct details<\/li>\n<li>Exhaust requirement<\/li>\n<li>Chilled-water or DX requirement<\/li>\n<li>BMS requirement<\/li>\n<li>Number of AHUs<\/li>\n<li>Installation requirements<\/li>\n<\/ol>\n<p>The more complete the technical information, the more accurately the AHU can be selected.<\/p>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions\"><\/span>Frequently Asked Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3>What is a 100% Fresh Air AHU?<\/h3>\n<p>A 100% Fresh Air AHU is an air-handling unit designed to condition outdoor air for supply to a building or process area without intentionally mixing return air into that supply-air stream.<\/p>\n<h3>What is the difference between 100% Fresh Air AHU and FAHU?<\/h3>\n<p>In many HVAC projects, the terms are used interchangeably. FAHU means <strong>Fresh Air Handling Unit<\/strong>. The exact terminology can vary by project and supplier.<\/p>\n<h3>Does a 100% Fresh Air AHU use return air?<\/h3>\n<p>The supply-air stream is designed around outdoor air rather than return-air mixing. However, the building still needs an appropriate exhaust or relief-air strategy.<\/p>\n<h3>Is 100% fresh air always better?<\/h3>\n<p>Not necessarily. A 100% outdoor-air system can provide strong ventilation control, but it can also increase cooling, heating and fan energy requirements. The correct solution depends on the building and process.<\/p>\n<h3>Does a 100% Fresh Air AHU require an exhaust system?<\/h3>\n<p>Usually, the ventilation strategy needs an appropriate exhaust or relief path so that the supplied outdoor air can displace indoor air and the building pressure remains controlled.<\/p>\n<h3>Can HEPA filters be installed?<\/h3>\n<p>Yes. HEPA filtration can be incorporated where the application requires it, but the additional pressure drop and energy impact should be considered during design.<\/p>\n<h3>Can a 100% Fresh Air AHU be connected to a chiller?<\/h3>\n<p>Yes. A chilled-water Fresh Air AHU can use chilled water supplied from a central chiller plant.<\/p>\n<h3>Can it control humidity?<\/h3>\n<p>Yes. A properly selected cooling coil can provide dehumidification, and additional humidity-control equipment can be incorporated where required.<\/p>\n<h3>Where are 100% Fresh Air AHUs used?<\/h3>\n<p>Applications include pharmaceutical plants, cleanrooms, laboratories, hospitals, chemical industries, manufacturing plants, food-processing facilities, textile industries and selected commercial buildings.<\/p>\n<h3>Does VIPUL HVAC supply Fresh Air AHUs?<\/h3>\n<p>Yes. VIPUL HVAC provides customized AHU solutions including treated fresh-air units, filtration, coils, fans, controls, installation, commissioning and maintenance. <a href=\"https:\/\/vipulhvacsolution.in\/blog\/ahu-supplier-in-india\/\">Vipulhvac Solution<\/a><\/p>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A <strong>100% Fresh Air AHU<\/strong> is a specialized HVAC solution designed to condition outdoor air before supplying it to a building or industrial process area.<\/p>\n<p>Its working principle can be summarized as:<\/p>\n<p><strong>Outdoor Air \u2192 Filtration \u2192 Cooling\/Heating \u2192 Humidity Treatment \u2192 Fan \u2192 Supply \u2192 Exhaust\/Relief<\/strong><\/p>\n<p>The major benefits include controlled outdoor-air supply, ventilation management, flexible filtration, process ventilation support and integration with modern HVAC controls.<\/p>\n<p>However, 100% outdoor-air systems can have higher cooling and heating loads than mixed-air systems. Therefore, <strong>proper engineering, filtration selection, energy recovery, fan selection, duct design and controls are essential<\/strong>.<\/p>\n<p>For pharmaceutical, chemical, industrial, healthcare, cleanroom, food-processing, textile and commercial projects, the 100% Fresh Air AHU should be designed according to the specific application and applicable standards. ASHRAE Standard 62.1-2025 is the current published standard addressing ventilation and acceptable indoor air quality for covered commercial and institutional spaces. <a href=\"https:\/\/www.ashrae.org\/technical-resources\/standards-and-guidelines\/titles-purposes-and-scopes\" target=\"_blank\" rel=\"noopener\">ASHRAE<\/a><\/p>\n<h3>Need a 100% Fresh Air AHU?<\/h3>\n<p><strong>VIPUL HVAC SOLUTION PVT. LTD.<\/strong><\/p>\n<p><strong>100% Fresh Air AHU | FAHU | Industrial HVAC | Filtration | Ventilation | AHU Design | Installation | Commissioning | AMC<\/strong><\/p>\n<p>\ud83d\udcde <strong>Call: +91 8000392000<\/strong><\/p>\n<hr \/>\n<h3>Important Links:<\/h3>\n<ul>\n<li><a href=\"https:\/\/vipulhvacsolution.in\/blog\/ahu-supplier-in-india\/\"><strong>AHU Supplier in India<\/strong><\/a><\/li>\n<li><a href=\"https:\/\/vipulhvacsolution.in\/blog\/ahu-supplier-in-gujarat\/\"><strong>AHU Supplier in Gujarat<\/strong><\/a><\/li>\n<li><a href=\"https:\/\/vipulhvacsolution.in\/blog\/ahu-supplier-in-ankleshwar\/\"><strong>AHU Supplier in Ankleshwar<\/strong><\/a><\/li>\n<li><a href=\"https:\/\/vipulhvacsolution.in\/blog\/ahu-supplier-in-bharuch\/\"><strong>AHU Supplier in Bharuch<\/strong><\/a><\/li>\n<li><a href=\"https:\/\/vipulhvacsolution.in\/blog\/ahu-supplier-in-surat\/\"><strong>AHU Supplier in Surat<\/strong><\/a><\/li>\n<li><a href=\"https:\/\/vipulhvacsolution.in\/blog\/ahu-supplier-in-ahmedabad\/\"><strong>AHU Supplier in Ahmedabad<\/strong><\/a><\/li>\n<li><a href=\"https:\/\/vipulhvacsolution.in\/blog\/ahu-supplier-in-vadodara\/\"><strong>AHU Supplier in Vadodara<\/strong><\/a><\/li>\n<li><a href=\"https:\/\/vipulhvacsolution.in\/blog\/fresh-air-ahu\/\"><strong>Fresh Air AHU<\/strong><\/a><\/li>\n<li><a href=\"https:\/\/vipulhvacsolution.in\/blog\/fresh-air-ventilation-system-for-office\/\"><strong>Fresh Air Ventilation System for Office<\/strong><\/a><\/li>\n<li><a href=\"https:\/\/vipulhvacsolution.in\/blog\/fresh-air-ventilation-system-for-hospital\/\"><strong>Fresh Air Ventilation System for Hospital<\/strong><\/a><\/li>\n<li><a href=\"https:\/\/vipulhvacsolution.in\/blog\/fresh-air-ventilation-system-for-hotel\/\"><strong>Fresh Air Ventilation System for Hotel<\/strong><\/a><\/li>\n<li><a href=\"https:\/\/vipulhvacsolution.in\/blog\/ahu-contractor-in-gujarat\/\"><strong>AHU Contractor in Gujarat<\/strong><\/a><\/li>\n<li><a href=\"https:\/\/vipulhvacsolution.in\/blog\/hvac-turnkey-services-gujarat\/\"><strong>HVAC Turnkey Services Gujarat<\/strong><\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>100% Fresh Air AHU: Working Principle, Applications &amp; Benefits A 100% Fresh Air AHU is an air-handling system designed to supply conditioned outdoor air without intentionally mixing return air into the supply-air stream. It is also commonly described as a 100% Outdoor Air AHU, Fresh Air Handling Unit (FAHU) or, depending on the project, a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":816,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[],"class_list":["post-813","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ahu"],"_links":{"self":[{"href":"https:\/\/vipulhvacsolution.in\/blog\/wp-json\/wp\/v2\/posts\/813","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=813"}],"version-history":[{"count":4,"href":"https:\/\/vipulhvacsolution.in\/blog\/wp-json\/wp\/v2\/posts\/813\/revisions"}],"predecessor-version":[{"id":818,"href":"https:\/\/vipulhvacsolution.in\/blog\/wp-json\/wp\/v2\/posts\/813\/revisions\/818"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vipulhvacsolution.in\/blog\/wp-json\/wp\/v2\/media\/816"}],"wp:attachment":[{"href":"https:\/\/vipulhvacsolution.in\/blog\/wp-json\/wp\/v2\/media?parent=813"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vipulhvacsolution.in\/blog\/wp-json\/wp\/v2\/categories?post=813"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vipulhvacsolution.in\/blog\/wp-json\/wp\/v2\/tags?post=813"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}