{"id":413,"date":"2026-09-18T06:48:32","date_gmt":"2026-09-18T06:48:32","guid":{"rendered":"https:\/\/vipulhvacsolution.in\/blog\/?p=413"},"modified":"2026-09-18T07:08:33","modified_gmt":"2026-09-18T07:08:33","slug":"what-is-the-difference-between-grille-and-louver","status":"publish","type":"post","link":"https:\/\/vipulhvacsolution.in\/blog\/what-is-the-difference-between-grille-and-louver\/","title":{"rendered":"What is the difference between grille and louver"},"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\/what-is-the-difference-between-grille-and-louver\/#What_Is_the_Difference_Between_Grille_and_Louver_Complete_HVAC_Guide\" >What Is the Difference Between Grille and Louver? 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\/what-is-the-difference-between-grille-and-louver\/#What_Is_a_Grille_in_HVAC\" >What Is a Grille in HVAC?<\/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\/what-is-the-difference-between-grille-and-louver\/#What_Is_a_Louver_in_HVAC\" >What Is a Louver in HVAC?<\/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\/what-is-the-difference-between-grille-and-louver\/#Grille_vs_Louver_Quick_Comparison\" >Grille vs Louver: Quick Comparison<\/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\/what-is-the-difference-between-grille-and-louver\/#7_Key_Differences_Between_Grille_and_Louver\" >7 Key Differences Between Grille and Louver<\/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\/what-is-the-difference-between-grille-and-louver\/#Supply_Air_Grille_vs_Return_Air_Grille\" >Supply Air Grille vs Return Air Grille<\/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\/what-is-the-difference-between-grille-and-louver\/#Fresh_Air_Louver\" >Fresh Air Louver<\/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\/what-is-the-difference-between-grille-and-louver\/#Exhaust_Louver\" >Exhaust Louver<\/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\/what-is-the-difference-between-grille-and-louver\/#Grille_vs_Louver_for_Fresh_Air\" >Grille vs Louver for Fresh Air<\/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\/what-is-the-difference-between-grille-and-louver\/#Grille_vs_Louver_for_Exhaust_Air\" >Grille vs Louver for Exhaust Air<\/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\/what-is-the-difference-between-grille-and-louver\/#Can_a_Louver_Be_Used_as_a_Grille\" >Can a Louver Be Used as a Grille?<\/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\/what-is-the-difference-between-grille-and-louver\/#Can_a_Grille_Be_Used_as_an_External_Louver\" >Can a Grille Be Used as an External Louver?<\/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\/what-is-the-difference-between-grille-and-louver\/#Grille_vs_Louver_Which_One_Is_Better\" >Grille vs Louver: Which One Is Better?<\/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\/what-is-the-difference-between-grille-and-louver\/#How_to_Select_the_Correct_Grille_or_Louver\" >How to Select the Correct Grille or Louver<\/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\/what-is-the-difference-between-grille-and-louver\/#Grille_and_Louver_in_a_Complete_HVAC_System\" >Grille and Louver in a Complete HVAC System<\/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\/what-is-the-difference-between-grille-and-louver\/#Grilles_Louvers_and_Diffusers_Whats_the_Difference\" >Grilles, Louvers and Diffusers: What&#8217;s the Difference?<\/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\/what-is-the-difference-between-grille-and-louver\/#Common_Mistakes_When_Selecting_Grilles_and_Louvers\" >Common Mistakes When Selecting Grilles and Louvers<\/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\/what-is-the-difference-between-grille-and-louver\/#Why_Grille_and_Louver_Selection_Matters\" >Why Grille and Louver Selection Matters<\/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\/what-is-the-difference-between-grille-and-louver\/#Grille_and_Louver_Solutions_by_VIPUL_HVAC\" >Grille and Louver Solutions by VIPUL HVAC<\/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\/what-is-the-difference-between-grille-and-louver\/#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-21\" href=\"https:\/\/vipulhvacsolution.in\/blog\/what-is-the-difference-between-grille-and-louver\/#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-22\" href=\"https:\/\/vipulhvacsolution.in\/blog\/what-is-the-difference-between-grille-and-louver\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"PDq2pG_selectionAnchorContainer\" dir=\"auto\" data-section-id=\"134c5j\" data-start=\"0\" data-end=\"71\"><span class=\"ez-toc-section\" id=\"What_Is_the_Difference_Between_Grille_and_Louver_Complete_HVAC_Guide\"><\/span>What Is the Difference Between Grille and Louver? Complete HVAC Guide<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"73\" data-end=\"236\">If you are designing an HVAC, ventilation, fresh-air or exhaust system, you may come across two commonly used air-distribution components: <strong data-start=\"212\" data-end=\"235\">grilles and louvers<\/strong>.<\/p>\n<p dir=\"auto\" data-start=\"238\" data-end=\"372\">Although both can have horizontal or vertical blades and may look similar, they are <strong data-start=\"322\" data-end=\"371\">not necessarily designed for the same purpose<\/strong>.<\/p>\n<h3 dir=\"auto\" data-section-id=\"7oc9j3\" data-start=\"374\" data-end=\"390\">Quick answer<\/h3>\n<p dir=\"auto\" data-start=\"392\" data-end=\"683\">A <strong data-start=\"394\" data-end=\"404\">grille<\/strong> is primarily an air terminal used to <strong data-start=\"442\" data-end=\"502\">supply, return or exhaust air within a conditioned space<\/strong>. A <strong data-start=\"506\" data-end=\"516\">louver<\/strong> is commonly used for <strong data-start=\"538\" data-end=\"614\">outdoor air intake, exhaust, weather protection and ventilation openings<\/strong>, although specialized louvers can also be used for air distribution.<\/p>\n<p dir=\"auto\" data-start=\"685\" data-end=\"929\">ASHRAE identifies grilles as air-distribution devices used in sidewall, ceiling, sill and floor applications, while intake and exhaust louvers are used for outdoor-air openings and ventilation applications.<\/p>\n<p dir=\"auto\" data-start=\"931\" data-end=\"951\"><strong>So, in simple terms:<\/strong><\/p>\n<blockquote data-start=\"953\" data-end=\"1137\">\n<p dir=\"auto\" data-start=\"955\" data-end=\"1137\"><strong data-start=\"955\" data-end=\"1026\">Grille = mainly controls air entering or leaving an occupied space.<\/strong><br data-start=\"1026\" data-end=\"1029\" \/><strong data-start=\"1031\" data-end=\"1137\">Louver = commonly protects and controls air entering or leaving a building through an outdoor opening.<\/strong><\/p>\n<\/blockquote>\n<p dir=\"auto\" data-start=\"1139\" data-end=\"1288\">The correct selection depends on <strong data-start=\"1172\" data-end=\"1287\">airflow, pressure drop, velocity, weather exposure, location, noise, free area and the required airflow pattern<\/strong>.<\/p>\n<hr data-start=\"2380\" data-end=\"2383\" \/>\n<h2 dir=\"auto\" data-section-id=\"1btdb3e\" data-start=\"2385\" data-end=\"2412\"><span class=\"ez-toc-section\" id=\"What_Is_a_Grille_in_HVAC\"><\/span>What Is a Grille in HVAC?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"2414\" data-end=\"2538\">An <strong data-start=\"2417\" data-end=\"2432\">HVAC grille<\/strong> is an air terminal device installed at an opening through which conditioned, return or exhaust air moves.<\/p>\n<p dir=\"auto\" data-start=\"2540\" data-end=\"2734\">ASHRAE describes a grille as a frame containing vertical or horizontal vanes. Supply grilles can have adjustable blades to control the direction of airflow.<\/p>\n<p dir=\"auto\" data-start=\"2736\" data-end=\"2790\"><strong>Depending on the application, grilles can be used for:<\/strong><\/p>\n<ul data-start=\"2792\" data-end=\"2926\">\n<li data-section-id=\"3zizep\" data-start=\"2792\" data-end=\"2804\">Supply air<\/li>\n<li data-section-id=\"1d8vuns\" data-start=\"2805\" data-end=\"2817\">Return air<\/li>\n<li data-section-id=\"1uhrh0\" data-start=\"2818\" data-end=\"2831\">Exhaust air<\/li>\n<li data-section-id=\"14peft\" data-start=\"2832\" data-end=\"2846\">Transfer air<\/li>\n<li data-section-id=\"d4gxao\" data-start=\"2847\" data-end=\"2871\">Floor air distribution<\/li>\n<li data-section-id=\"1im57pb\" data-start=\"2872\" data-end=\"2903\">Wall-mounted air distribution<\/li>\n<li data-section-id=\"mjlghu\" data-start=\"2904\" data-end=\"2926\">Ceiling applications<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"2928\" data-end=\"3030\">A grille can therefore be part of the final connection between the duct system and the occupied space.<\/p>\n<h3 dir=\"auto\" data-section-id=\"o1ngjk\" data-start=\"3032\" data-end=\"3050\">Simple example<\/h3>\n<p dir=\"auto\" data-start=\"3052\" data-end=\"3098\"><strong data-start=\"3052\" data-end=\"3098\">AHU \u2192 Supply Duct \u2192 Supply Grille \u2192 Office<\/strong><\/p>\n<p dir=\"auto\" data-start=\"3100\" data-end=\"3103\">or:<\/p>\n<p dir=\"auto\" data-start=\"3105\" data-end=\"3151\"><strong data-start=\"3105\" data-end=\"3151\">Office \u2192 Return Grille \u2192 Return Duct \u2192 AHU<\/strong><\/p>\n<hr data-start=\"3153\" data-end=\"3156\" \/>\n<h2 dir=\"auto\" data-section-id=\"1vu5ysk\" data-start=\"3158\" data-end=\"3185\"><span class=\"ez-toc-section\" id=\"What_Is_a_Louver_in_HVAC\"><\/span>What Is a Louver in HVAC?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"3187\" data-end=\"3338\">A <strong data-start=\"3189\" data-end=\"3199\">louver<\/strong> is an assembly of blades designed to control airflow through an opening while providing additional functions depending on its application.<\/p>\n<p dir=\"auto\" data-start=\"3340\" data-end=\"3369\"><strong>Louvers are commonly used at:<\/strong><\/p>\n<ul data-start=\"3371\" data-end=\"3537\">\n<li data-section-id=\"16kjhn2\" data-start=\"3371\" data-end=\"3398\">Fresh-air intake openings<\/li>\n<li data-section-id=\"1tajh32\" data-start=\"3399\" data-end=\"3421\">Exhaust-air openings<\/li>\n<li data-section-id=\"1shqy3z\" data-start=\"3422\" data-end=\"3440\">Mechanical rooms<\/li>\n<li data-section-id=\"yj277\" data-start=\"3441\" data-end=\"3454\">Plant rooms<\/li>\n<li data-section-id=\"gm0gul\" data-start=\"3455\" data-end=\"3473\">Building fa\u00e7ades<\/li>\n<li data-section-id=\"lc6mt3\" data-start=\"3474\" data-end=\"3491\">Generator rooms<\/li>\n<li data-section-id=\"inzqnm\" data-start=\"3492\" data-end=\"3514\">HVAC equipment rooms<\/li>\n<li data-section-id=\"lnbs8u\" data-start=\"3515\" data-end=\"3537\">Ventilation openings<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"3539\" data-end=\"3687\">External louvers can also help prevent rain, debris and unwanted outdoor elements from entering the ventilation opening when appropriately designed.<\/p>\n<p dir=\"auto\" data-start=\"3689\" data-end=\"3911\">ASHRAE provides specific guidance for preliminary sizing of <strong data-start=\"3749\" data-end=\"3783\">air intake and exhaust louvers<\/strong>, demonstrating that louvers are an important part of ventilation and outdoor-air systems.<\/p>\n<hr data-start=\"3913\" data-end=\"3916\" \/>\n<h2 dir=\"auto\" data-section-id=\"anxqj\" data-start=\"3918\" data-end=\"3954\"><span class=\"ez-toc-section\" id=\"Grille_vs_Louver_Quick_Comparison\"><\/span>Grille vs Louver: Quick Comparison<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: 493px;\" width=\"1091\" data-start=\"3956\" data-end=\"4971\">\n<thead data-start=\"3956\" data-end=\"3985\">\n<tr data-start=\"3956\" data-end=\"3985\">\n<th class=\"last:pe-10\" data-start=\"3956\" data-end=\"3966\" data-col-size=\"sm\">Feature<\/th>\n<th class=\"last:pe-10\" data-start=\"3966\" data-end=\"3975\" data-col-size=\"sm\">Grille<\/th>\n<th class=\"last:pe-10\" data-start=\"3975\" data-end=\"3985\" data-col-size=\"md\">Louver<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"4000\" data-end=\"4971\">\n<tr data-start=\"4000\" data-end=\"4090\">\n<td data-start=\"4000\" data-end=\"4015\" data-col-size=\"sm\">Main purpose<\/td>\n<td data-start=\"4015\" data-end=\"4049\" data-col-size=\"sm\">Air distribution\/return\/exhaust<\/td>\n<td data-start=\"4049\" data-end=\"4090\" data-col-size=\"md\">Air intake\/exhaust\/weather protection<\/td>\n<\/tr>\n<tr data-start=\"4091\" data-end=\"4179\">\n<td data-start=\"4091\" data-end=\"4110\" data-col-size=\"sm\">Typical location<\/td>\n<td data-start=\"4110\" data-end=\"4135\" data-col-size=\"sm\">Inside occupied spaces<\/td>\n<td data-start=\"4135\" data-end=\"4179\" data-col-size=\"md\">Building exterior or ventilation opening<\/td>\n<\/tr>\n<tr data-start=\"4180\" data-end=\"4227\">\n<td data-start=\"4180\" data-end=\"4193\" data-col-size=\"sm\">Supply air<\/td>\n<td data-start=\"4193\" data-end=\"4202\" data-col-size=\"sm\">Common<\/td>\n<td data-start=\"4202\" data-end=\"4227\" data-col-size=\"md\">Application dependent<\/td>\n<\/tr>\n<tr data-start=\"4228\" data-end=\"4271\">\n<td data-start=\"4228\" data-end=\"4241\" data-col-size=\"sm\">Return air<\/td>\n<td data-start=\"4241\" data-end=\"4255\" data-col-size=\"sm\">Very common<\/td>\n<td data-start=\"4255\" data-end=\"4271\" data-col-size=\"md\">Less typical<\/td>\n<\/tr>\n<tr data-start=\"4272\" data-end=\"4336\">\n<td data-start=\"4272\" data-end=\"4293\" data-col-size=\"sm\">Outdoor air intake<\/td>\n<td data-start=\"4293\" data-end=\"4326\" data-col-size=\"sm\">Not usually the primary choice<\/td>\n<td data-start=\"4326\" data-end=\"4336\" data-col-size=\"md\">Common<\/td>\n<\/tr>\n<tr data-start=\"4337\" data-end=\"4366\">\n<td data-start=\"4337\" data-end=\"4347\" data-col-size=\"sm\">Exhaust<\/td>\n<td data-start=\"4347\" data-end=\"4356\" data-col-size=\"sm\">Common<\/td>\n<td data-start=\"4356\" data-end=\"4366\" data-col-size=\"md\">Common<\/td>\n<\/tr>\n<tr data-start=\"4367\" data-end=\"4427\">\n<td data-start=\"4367\" data-end=\"4388\" data-col-size=\"sm\">Weather protection<\/td>\n<td data-start=\"4388\" data-end=\"4398\" data-col-size=\"sm\">Limited<\/td>\n<td data-col-size=\"md\" data-start=\"4398\" data-end=\"4427\">Common design requirement<\/td>\n<\/tr>\n<tr data-start=\"4428\" data-end=\"4511\">\n<td data-start=\"4428\" data-end=\"4452\" data-col-size=\"sm\">Air direction control<\/td>\n<td data-start=\"4452\" data-end=\"4471\" data-col-size=\"sm\">Often adjustable<\/td>\n<td data-start=\"4471\" data-end=\"4511\" data-col-size=\"md\">Usually controlled by blade geometry<\/td>\n<\/tr>\n<tr data-start=\"4512\" data-end=\"4573\">\n<td data-start=\"4512\" data-end=\"4525\" data-col-size=\"sm\">Appearance<\/td>\n<td data-start=\"4525\" data-end=\"4550\" data-col-size=\"sm\">Interior architectural<\/td>\n<td data-start=\"4550\" data-end=\"4573\" data-col-size=\"md\">Exterior\/industrial<\/td>\n<\/tr>\n<tr data-start=\"4574\" data-end=\"4636\">\n<td data-start=\"4574\" data-end=\"4595\" data-col-size=\"sm\">Weather resistance<\/td>\n<td data-start=\"4595\" data-end=\"4617\" data-col-size=\"sm\">Usually not primary<\/td>\n<td data-start=\"4617\" data-end=\"4636\" data-col-size=\"md\">Often important<\/td>\n<\/tr>\n<tr data-start=\"4637\" data-end=\"4730\">\n<td data-start=\"4637\" data-end=\"4659\" data-col-size=\"sm\">Typical application<\/td>\n<td data-col-size=\"sm\" data-start=\"4659\" data-end=\"4695\">Offices, homes, commercial spaces<\/td>\n<td data-col-size=\"md\" data-start=\"4695\" data-end=\"4730\">Fresh air, exhaust, plant rooms<\/td>\n<\/tr>\n<tr data-start=\"4731\" data-end=\"4768\">\n<td data-start=\"4731\" data-end=\"4749\" data-col-size=\"sm\">Duct connection<\/td>\n<td data-start=\"4749\" data-end=\"4758\" data-col-size=\"sm\">Common<\/td>\n<td data-start=\"4758\" data-end=\"4768\" data-col-size=\"md\">Common<\/td>\n<\/tr>\n<tr data-start=\"4769\" data-end=\"4856\">\n<td data-start=\"4769\" data-end=\"4791\" data-col-size=\"sm\">Blade configuration<\/td>\n<td data-start=\"4791\" data-end=\"4813\" data-col-size=\"sm\">Fixed or adjustable<\/td>\n<td data-start=\"4813\" data-end=\"4856\" data-col-size=\"md\">Fixed, drainable or specialized designs<\/td>\n<\/tr>\n<tr data-start=\"4857\" data-end=\"4971\">\n<td data-start=\"4857\" data-end=\"4880\" data-col-size=\"sm\">Selection parameters<\/td>\n<td data-start=\"4880\" data-end=\"4910\" data-col-size=\"sm\">CFM, throw, velocity, noise<\/td>\n<td data-start=\"4910\" data-end=\"4971\" data-col-size=\"md\">CFM, velocity, pressure drop, free area, weather exposure<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<hr data-start=\"4973\" data-end=\"4976\" \/>\n<h2 dir=\"auto\" data-section-id=\"x3zrxp\" data-start=\"4978\" data-end=\"5023\"><span class=\"ez-toc-section\" id=\"7_Key_Differences_Between_Grille_and_Louver\"><\/span>7 Key Differences Between Grille and Louver<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 dir=\"auto\" data-section-id=\"1y8qtd4\" data-start=\"5025\" data-end=\"5046\">1. Primary Purpose<\/h3>\n<p dir=\"auto\" data-start=\"5048\" data-end=\"5119\">The first major difference is <strong data-start=\"5078\" data-end=\"5118\">what the component is intended to do<\/strong>.<\/p>\n<h3 dir=\"auto\" data-section-id=\"cdg18f\" data-start=\"5121\" data-end=\"5131\">Grille<\/h3>\n<p dir=\"auto\" data-start=\"5133\" data-end=\"5206\">A grille is commonly used to distribute or collect air within a building.<\/p>\n<p dir=\"auto\" data-start=\"5208\" data-end=\"5220\"><strong>For example:<\/strong><\/p>\n<p dir=\"auto\" data-start=\"5222\" data-end=\"5265\"><strong data-start=\"5222\" data-end=\"5265\">Supply duct \u2192 grille \u2192 conditioned room<\/strong><\/p>\n<p dir=\"auto\" data-start=\"5267\" data-end=\"5295\"><strong>The grille can help control:<\/strong><\/p>\n<ul data-start=\"5297\" data-end=\"5354\">\n<li data-section-id=\"6cpunr\" data-start=\"5297\" data-end=\"5312\">Air direction<\/li>\n<li data-section-id=\"177wntq\" data-start=\"5313\" data-end=\"5320\">Throw<\/li>\n<li data-section-id=\"gevrr9\" data-start=\"5321\" data-end=\"5335\">Air velocity<\/li>\n<li data-section-id=\"1ebqqzs\" data-start=\"5336\" data-end=\"5354\">Air distribution<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"5356\" data-end=\"5494\">ASHRAE notes that adjustable-blade grilles can control airflow in horizontal and\/or vertical planes.<\/p>\n<h3 dir=\"auto\" data-section-id=\"lmme0h\" data-start=\"5496\" data-end=\"5506\">Louver<\/h3>\n<p dir=\"auto\" data-start=\"5508\" data-end=\"5575\">A louver is commonly associated with building ventilation openings.<\/p>\n<p dir=\"auto\" data-start=\"5577\" data-end=\"5589\"><strong>For example:<\/strong><\/p>\n<p dir=\"auto\" data-start=\"5591\" data-end=\"5633\"><strong data-start=\"5591\" data-end=\"5633\">Outdoor air \u2192 intake louver \u2192 FAHU\/AHU<\/strong><\/p>\n<p dir=\"auto\" data-start=\"5635\" data-end=\"5638\"><strong>or:<\/strong><\/p>\n<p dir=\"auto\" data-start=\"5640\" data-end=\"5689\"><strong data-start=\"5640\" data-end=\"5689\">Exhaust fan \u2192 duct \u2192 exhaust louver \u2192 outdoor<\/strong><\/p>\n<hr data-start=\"5691\" data-end=\"5694\" \/>\n<h3 dir=\"auto\" data-section-id=\"18qiq1z\" data-start=\"5696\" data-end=\"5709\">2. Location<\/h3>\n<h3 dir=\"auto\" data-section-id=\"n19opn\" data-start=\"5711\" data-end=\"5762\">Grilles are commonly installed inside buildings<\/h3>\n<p dir=\"auto\" data-start=\"5764\" data-end=\"5790\"><strong>Typical locations include:<\/strong><\/p>\n<ul data-start=\"5792\" data-end=\"5849\">\n<li data-section-id=\"17bf4p9\" data-start=\"5792\" data-end=\"5799\">Walls<\/li>\n<li data-section-id=\"wpxu1k\" data-start=\"5800\" data-end=\"5810\">Ceilings<\/li>\n<li data-section-id=\"1y1pvvn\" data-start=\"5811\" data-end=\"5819\">Floors<\/li>\n<li data-section-id=\"178fu69\" data-start=\"5820\" data-end=\"5827\">Sills<\/li>\n<li data-section-id=\"1x5mz2q\" data-start=\"5828\" data-end=\"5849\">Return-air openings<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"5851\" data-end=\"5979\">ASHRAE specifically identifies sidewall, ceiling, sill and floor applications for grilles.<\/p>\n<h3 dir=\"auto\" data-section-id=\"20ycq0\" data-start=\"5981\" data-end=\"6036\">Louvers are commonly installed at building openings<\/h3>\n<p dir=\"auto\" data-start=\"6038\" data-end=\"6055\"><strong>Examples include:<\/strong><\/p>\n<ul data-start=\"6057\" data-end=\"6164\">\n<li data-section-id=\"loi4ds\" data-start=\"6057\" data-end=\"6073\">External walls<\/li>\n<li data-section-id=\"1shqy3z\" data-start=\"6074\" data-end=\"6092\">Mechanical rooms<\/li>\n<li data-section-id=\"yj277\" data-start=\"6093\" data-end=\"6106\">Plant rooms<\/li>\n<li data-section-id=\"j6p99g\" data-start=\"6107\" data-end=\"6117\">Rooftops<\/li>\n<li data-section-id=\"16kjhn2\" data-start=\"6118\" data-end=\"6145\">Fresh-air intake openings<\/li>\n<li data-section-id=\"17ekgzt\" data-start=\"6146\" data-end=\"6164\">Exhaust openings<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"6166\" data-end=\"6273\">This makes weather and environmental exposure an important consideration when selecting an external louver.<\/p>\n<hr data-start=\"6275\" data-end=\"6278\" \/>\n<h3 dir=\"auto\" data-section-id=\"15aomwm\" data-start=\"6280\" data-end=\"6302\">3. Airflow Direction<\/h3>\n<p dir=\"auto\" data-start=\"6304\" data-end=\"6372\">A grille can be designed to control the direction of the supply air.<\/p>\n<p dir=\"auto\" data-start=\"6374\" data-end=\"6489\">For example, an adjustable double-deflection grille can control airflow in both horizontal and vertical directions.<\/p>\n<p dir=\"auto\" data-start=\"6491\" data-end=\"6577\">This is useful when the objective is to deliver conditioned air into an occupied zone.<\/p>\n<p dir=\"auto\" data-start=\"6579\" data-end=\"6744\">ASHRAE describes single- and double-deflection grille configurations and how their blade arrangements affect airflow direction.<\/p>\n<p dir=\"auto\" data-start=\"6746\" data-end=\"6855\">Louvers are generally designed around the airflow and opening requirements of intake or exhaust applications.<\/p>\n<hr data-start=\"6857\" data-end=\"6860\" \/>\n<h3 dir=\"auto\" data-section-id=\"n82hev\" data-start=\"6862\" data-end=\"6885\">4. Weather Protection<\/h3>\n<p dir=\"auto\" data-start=\"6887\" data-end=\"6933\">This is one of the most important differences.<\/p>\n<p dir=\"auto\" data-start=\"6935\" data-end=\"6980\"><strong>An external louver may need to deal with:<\/strong><\/p>\n<ul data-start=\"6982\" data-end=\"7071\">\n<li data-section-id=\"1j4eem4\" data-start=\"6982\" data-end=\"6988\">Rain<\/li>\n<li data-section-id=\"1j4gg3g\" data-start=\"6989\" data-end=\"6995\">Wind<\/li>\n<li data-section-id=\"1j40wse\" data-start=\"6996\" data-end=\"7002\">Dust<\/li>\n<li data-section-id=\"1udi8kj\" data-start=\"7003\" data-end=\"7011\">Debris<\/li>\n<li data-section-id=\"krdpgc\" data-start=\"7012\" data-end=\"7033\">Outdoor temperature<\/li>\n<li data-section-id=\"11rriz4\" data-start=\"7034\" data-end=\"7045\">Corrosion<\/li>\n<li data-section-id=\"trftb1\" data-start=\"7046\" data-end=\"7055\">Insects<\/li>\n<li data-section-id=\"d1yobo\" data-start=\"7056\" data-end=\"7071\">Pressure drop<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"7073\" data-end=\"7172\">A normal interior grille is generally not designed to provide the same level of weather protection.<\/p>\n<p dir=\"auto\" data-start=\"7174\" data-end=\"7295\">Therefore, installing an ordinary indoor grille as an external fresh-air intake may not provide the required performance.<\/p>\n<hr data-start=\"7297\" data-end=\"7300\" \/>\n<h3 dir=\"auto\" data-section-id=\"1tghhvd\" data-start=\"7302\" data-end=\"7334\">5. Free Area and Pressure Drop<\/h3>\n<p dir=\"auto\" data-start=\"7336\" data-end=\"7415\">Both grilles and louvers need to be selected according to airflow requirements.<\/p>\n<p dir=\"auto\" data-start=\"7417\" data-end=\"7488\"><strong>However, external ventilation louvers require careful consideration of:<\/strong><\/p>\n<ul data-start=\"7490\" data-end=\"7577\">\n<li data-section-id=\"ds6bz9\" data-start=\"7490\" data-end=\"7502\">Gross area<\/li>\n<li data-section-id=\"1mlf30r\" data-start=\"7503\" data-end=\"7514\">Free area<\/li>\n<li data-section-id=\"ywzqn2\" data-start=\"7515\" data-end=\"7530\">Face velocity<\/li>\n<li data-section-id=\"d1yobo\" data-start=\"7531\" data-end=\"7546\">Pressure drop<\/li>\n<li data-section-id=\"16hq76o\" data-start=\"7547\" data-end=\"7556\">Airflow<\/li>\n<li data-section-id=\"hvchps\" data-start=\"7557\" data-end=\"7577\">Weather conditions<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"7579\" data-end=\"7733\">ASHRAE provides preliminary sizing guidance for air intake and exhaust louvers based on airflow and louver velocity.<\/p>\n<h3 dir=\"auto\" data-section-id=\"1vfizan\" data-start=\"7735\" data-end=\"7770\">Why is pressure drop important?<\/h3>\n<p dir=\"auto\" data-start=\"7772\" data-end=\"7858\">If the grille or louver creates excessive resistance, the fan may need to work harder.<\/p>\n<p dir=\"auto\" data-start=\"7860\" data-end=\"7876\"><strong>This can affect:<\/strong><\/p>\n<ul data-start=\"7878\" data-end=\"7946\">\n<li data-section-id=\"1i6pfs3\" data-start=\"7878\" data-end=\"7890\">Fan energy<\/li>\n<li data-section-id=\"16hq76o\" data-start=\"7891\" data-end=\"7900\">Airflow<\/li>\n<li data-section-id=\"1w2h34l\" data-start=\"7901\" data-end=\"7921\">System performance<\/li>\n<li data-section-id=\"16v87qu\" data-start=\"7922\" data-end=\"7929\">Noise<\/li>\n<li data-section-id=\"15omk5a\" data-start=\"7930\" data-end=\"7946\">Operating cost<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"7948\" data-end=\"7958\"><strong>Therefore:<\/strong><\/p>\n<blockquote data-start=\"7960\" data-end=\"8031\">\n<p dir=\"auto\" data-start=\"7962\" data-end=\"8031\"><strong data-start=\"7962\" data-end=\"8031\">Do not select a grille or louver based only on its physical size.<\/strong><\/p>\n<\/blockquote>\n<hr data-start=\"8033\" data-end=\"8036\" \/>\n<h3 dir=\"auto\" data-section-id=\"1mkvj5m\" data-start=\"8038\" data-end=\"8084\">6. Appearance and Architectural Requirements<\/h3>\n<p dir=\"auto\" data-start=\"8086\" data-end=\"8131\"><strong>Interior grilles are often selected to match:<\/strong><\/p>\n<ul data-start=\"8133\" data-end=\"8215\">\n<li data-section-id=\"9lnc23\" data-start=\"8133\" data-end=\"8142\">Ceiling<\/li>\n<li data-section-id=\"1j4gmda\" data-start=\"8143\" data-end=\"8149\">Wall<\/li>\n<li data-section-id=\"13hg6p6\" data-start=\"8150\" data-end=\"8167\">Interior design<\/li>\n<li data-section-id=\"1ltr4ja\" data-start=\"8168\" data-end=\"8178\">Lighting<\/li>\n<li data-section-id=\"1ycw02g\" data-start=\"8179\" data-end=\"8190\">Furniture<\/li>\n<li data-section-id=\"5p8cgg\" data-start=\"8191\" data-end=\"8215\">Architectural finishes<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"8217\" data-end=\"8269\"><strong>External louvers may be selected to coordinate with:<\/strong><\/p>\n<ul data-start=\"8271\" data-end=\"8381\">\n<li data-section-id=\"1g5u8hq\" data-start=\"8271\" data-end=\"8288\">Building fa\u00e7ade<\/li>\n<li data-section-id=\"1t97xik\" data-start=\"8289\" data-end=\"8308\">Exterior cladding<\/li>\n<li data-section-id=\"hbwaza\" data-start=\"8309\" data-end=\"8335\">Mechanical-room openings<\/li>\n<li data-section-id=\"1syssbh\" data-start=\"8336\" data-end=\"8355\">Rooftop equipment<\/li>\n<li data-section-id=\"1aylt16\" data-start=\"8356\" data-end=\"8381\">Industrial architecture<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"8383\" data-end=\"8476\">For commercial projects, appearance can therefore be an important part of terminal selection.<\/p>\n<hr data-start=\"8478\" data-end=\"8481\" \/>\n<h3 dir=\"auto\" data-section-id=\"1pm8in9\" data-start=\"8483\" data-end=\"8499\">7. Application<\/h3>\n<h3 dir=\"auto\" data-section-id=\"18lpg3w\" data-start=\"8501\" data-end=\"8532\">Typical grille applications<\/h3>\n<ul data-start=\"8534\" data-end=\"8662\">\n<li data-section-id=\"1q165iz\" data-start=\"8534\" data-end=\"8543\">Offices<\/li>\n<li data-section-id=\"16oi5x0\" data-start=\"8544\" data-end=\"8551\">Homes<\/li>\n<li data-section-id=\"1mvzzi9\" data-start=\"8552\" data-end=\"8560\">Hotels<\/li>\n<li data-section-id=\"1k0ubkf\" data-start=\"8561\" data-end=\"8572\">Hospitals<\/li>\n<li data-section-id=\"qcriyr\" data-start=\"8573\" data-end=\"8588\">Retail stores<\/li>\n<li data-section-id=\"jgudau\" data-start=\"8589\" data-end=\"8602\">Restaurants<\/li>\n<li data-section-id=\"bbisnx\" data-start=\"8603\" data-end=\"8618\">Meeting rooms<\/li>\n<li data-section-id=\"a4jaz5\" data-start=\"8619\" data-end=\"8641\">Commercial buildings<\/li>\n<li data-section-id=\"1ehuykc\" data-start=\"8642\" data-end=\"8662\">Industrial offices<\/li>\n<\/ul>\n<h3 dir=\"auto\" data-section-id=\"14sxc2\" data-start=\"8664\" data-end=\"8695\">Typical louver applications<\/h3>\n<ul data-start=\"8697\" data-end=\"8882\">\n<li data-section-id=\"1x2fo95\" data-start=\"8697\" data-end=\"8715\">Fresh-air intake<\/li>\n<li data-section-id=\"132aqrh\" data-start=\"8716\" data-end=\"8739\">Exhaust-air discharge<\/li>\n<li data-section-id=\"1shqy3z\" data-start=\"8740\" data-end=\"8758\">Mechanical rooms<\/li>\n<li data-section-id=\"lc6mt3\" data-start=\"8759\" data-end=\"8776\">Generator rooms<\/li>\n<li data-section-id=\"xm267y\" data-start=\"8777\" data-end=\"8801\">Industrial ventilation<\/li>\n<li data-section-id=\"vi3rxt\" data-start=\"8802\" data-end=\"8823\">Parking ventilation<\/li>\n<li data-section-id=\"yj277\" data-start=\"8824\" data-end=\"8837\">Plant rooms<\/li>\n<li data-section-id=\"lwegpy\" data-start=\"8838\" data-end=\"8859\">Rooftop ventilation<\/li>\n<li data-section-id=\"inzqnm\" data-start=\"8860\" data-end=\"8882\">HVAC equipment rooms<\/li>\n<\/ul>\n<hr data-start=\"8884\" data-end=\"8887\" \/>\n<h2 dir=\"auto\" data-section-id=\"i3c24a\" data-start=\"8889\" data-end=\"8929\"><span class=\"ez-toc-section\" id=\"Supply_Air_Grille_vs_Return_Air_Grille\"><\/span>Supply Air Grille vs Return Air Grille<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"8931\" data-end=\"8975\">Not every grille performs the same function.<\/p>\n<h3 dir=\"auto\" data-section-id=\"15t2md1\" data-start=\"8977\" data-end=\"8997\">Supply Air Grille<\/h3>\n<p dir=\"auto\" data-start=\"8999\" data-end=\"9055\">A supply grille delivers conditioned air into the space.<\/p>\n<p dir=\"auto\" data-start=\"9057\" data-end=\"9065\">Example:<\/p>\n<p dir=\"auto\" data-start=\"9067\" data-end=\"9104\"><strong data-start=\"9067\" data-end=\"9104\">AHU \u2192 Duct \u2192 Supply Grille \u2192 Room<\/strong><\/p>\n<p dir=\"auto\" data-start=\"9106\" data-end=\"9130\"><strong>It is selected based on:<\/strong><\/p>\n<ul data-start=\"9132\" data-end=\"9204\">\n<li data-section-id=\"16hq76o\" data-start=\"9132\" data-end=\"9141\">Airflow<\/li>\n<li data-section-id=\"177wntq\" data-start=\"9142\" data-end=\"9149\">Throw<\/li>\n<li data-section-id=\"1b6zfr3\" data-start=\"9150\" data-end=\"9160\">Velocity<\/li>\n<li data-section-id=\"16v87qu\" data-start=\"9161\" data-end=\"9168\">Noise<\/li>\n<li data-section-id=\"1n4dc5p\" data-start=\"9169\" data-end=\"9184\">Room geometry<\/li>\n<li data-section-id=\"1t1o8bc\" data-start=\"9185\" data-end=\"9204\">Mounting location<\/li>\n<\/ul>\n<h3 dir=\"auto\" data-section-id=\"1ixlz58\" data-start=\"9206\" data-end=\"9226\">Return Air Grille<\/h3>\n<p dir=\"auto\" data-start=\"9228\" data-end=\"9281\">A return grille collects air from the occupied space.<\/p>\n<p dir=\"auto\" data-start=\"9283\" data-end=\"9291\"><strong>Example:<\/strong><\/p>\n<p dir=\"auto\" data-start=\"9293\" data-end=\"9337\"><strong data-start=\"9293\" data-end=\"9337\">Room \u2192 Return Grille \u2192 Return Duct \u2192 AHU<\/strong><\/p>\n<p dir=\"auto\" data-start=\"9339\" data-end=\"9420\">Return grilles typically have different airflow requirements from supply grilles.<\/p>\n<hr data-start=\"9422\" data-end=\"9425\" \/>\n<h2 dir=\"auto\" data-section-id=\"i8dem9\" data-start=\"9427\" data-end=\"9445\"><span class=\"ez-toc-section\" id=\"Fresh_Air_Louver\"><\/span>Fresh Air Louver<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"9447\" data-end=\"9533\">A fresh-air louver is used to allow outdoor air to enter a ventilation or HVAC system.<\/p>\n<p dir=\"auto\" data-start=\"9535\" data-end=\"9555\"><strong>Typical arrangement:<\/strong><\/p>\n<p dir=\"auto\" data-start=\"9557\" data-end=\"9572\"><strong data-start=\"9557\" data-end=\"9572\">Outdoor Air<\/strong><\/p>\n<p dir=\"auto\" data-start=\"9574\" data-end=\"9575\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"9577\" data-end=\"9597\"><strong data-start=\"9577\" data-end=\"9597\">Fresh-Air Louver<\/strong><\/p>\n<p dir=\"auto\" data-start=\"9599\" data-end=\"9600\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"9602\" data-end=\"9612\"><strong data-start=\"9602\" data-end=\"9612\">Damper<\/strong><\/p>\n<p dir=\"auto\" data-start=\"9614\" data-end=\"9615\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"9617\" data-end=\"9627\"><strong data-start=\"9617\" data-end=\"9627\">Filter<\/strong><\/p>\n<p dir=\"auto\" data-start=\"9629\" data-end=\"9630\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"9632\" data-end=\"9644\"><strong data-start=\"9632\" data-end=\"9644\">FAHU\/AHU<\/strong><\/p>\n<p dir=\"auto\" data-start=\"9646\" data-end=\"9647\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"9649\" data-end=\"9664\"><strong data-start=\"9649\" data-end=\"9664\">Supply Duct<\/strong><\/p>\n<p dir=\"auto\" data-start=\"9666\" data-end=\"9667\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"9669\" data-end=\"9687\"><strong data-start=\"9669\" data-end=\"9687\">Occupied Space<\/strong><\/p>\n<p dir=\"auto\" data-start=\"9689\" data-end=\"9890\">VIPUL&#8217;s ventilation solutions include fresh-air handling units, supply\/exhaust fans, filters, dampers, heat-recovery systems and other air-distribution components.<\/p>\n<hr data-start=\"9892\" data-end=\"9895\" \/>\n<h2 dir=\"auto\" data-section-id=\"13kub93\" data-start=\"9897\" data-end=\"9913\"><span class=\"ez-toc-section\" id=\"Exhaust_Louver\"><\/span>Exhaust Louver<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"9915\" data-end=\"9989\">An exhaust louver allows unwanted or contaminated air to leave a building.<\/p>\n<p dir=\"auto\" data-start=\"9991\" data-end=\"10003\"><strong>For example:<\/strong><\/p>\n<p dir=\"auto\" data-start=\"10005\" data-end=\"10032\"><strong data-start=\"10005\" data-end=\"10032\">Kitchen\/Industrial Area<\/strong><\/p>\n<p dir=\"auto\" data-start=\"10034\" data-end=\"10035\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"10037\" data-end=\"10053\"><strong data-start=\"10037\" data-end=\"10053\">Exhaust Duct<\/strong><\/p>\n<p dir=\"auto\" data-start=\"10055\" data-end=\"10056\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"10058\" data-end=\"10073\"><strong data-start=\"10058\" data-end=\"10073\">Exhaust Fan<\/strong><\/p>\n<p dir=\"auto\" data-start=\"10075\" data-end=\"10076\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"10078\" data-end=\"10097\"><strong data-start=\"10078\" data-end=\"10097\">External Louver<\/strong><\/p>\n<p dir=\"auto\" data-start=\"10099\" data-end=\"10100\">\u2193<\/p>\n<p dir=\"auto\" data-start=\"10102\" data-end=\"10113\"><strong data-start=\"10102\" data-end=\"10113\">Outdoor<\/strong><\/p>\n<p dir=\"auto\" data-start=\"10115\" data-end=\"10140\"><strong>Applications can include:<\/strong><\/p>\n<ul data-start=\"10142\" data-end=\"10261\">\n<li data-section-id=\"12l4rfx\" data-start=\"10142\" data-end=\"10152\">Kitchens<\/li>\n<li data-section-id=\"13ovpxw\" data-start=\"10153\" data-end=\"10162\">Toilets<\/li>\n<li data-section-id=\"199z6tn\" data-start=\"10163\" data-end=\"10181\">Industrial areas<\/li>\n<li data-section-id=\"1shqy3z\" data-start=\"10182\" data-end=\"10200\">Mechanical rooms<\/li>\n<li data-section-id=\"lc6mt3\" data-start=\"10201\" data-end=\"10218\">Generator rooms<\/li>\n<li data-section-id=\"xlbjr8\" data-start=\"10219\" data-end=\"10234\">Parking areas<\/li>\n<li data-section-id=\"1i0u86j\" data-start=\"10235\" data-end=\"10261\">Manufacturing facilities<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"10263\" data-end=\"10370\">The exact louver design depends on airflow, discharge location, weather exposure and pressure requirements.<\/p>\n<hr data-start=\"10372\" data-end=\"10375\" \/>\n<h2 dir=\"auto\" data-section-id=\"d51mna\" data-start=\"10377\" data-end=\"10409\"><span class=\"ez-toc-section\" id=\"Grille_vs_Louver_for_Fresh_Air\"><\/span>Grille vs Louver for Fresh Air<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"10411\" data-end=\"10577\">If the requirement is <strong data-start=\"10433\" data-end=\"10487\">fresh-air intake through an external building wall<\/strong>, an appropriately designed <strong data-start=\"10515\" data-end=\"10532\">intake louver<\/strong> is generally the relevant type of component.<\/p>\n<p dir=\"auto\" data-start=\"10579\" data-end=\"10610\"><strong>A typical arrangement could be:<\/strong><\/p>\n<p dir=\"auto\" data-start=\"10612\" data-end=\"10675\"><strong data-start=\"10612\" data-end=\"10675\">Outside Air \u2192 Louver \u2192 Damper \u2192 Filter \u2192 FAHU \u2192 Duct \u2192 Room<\/strong><\/p>\n<p dir=\"auto\" data-start=\"10677\" data-end=\"10714\"><strong>The louver needs to be evaluated for:<\/strong><\/p>\n<ul data-start=\"10716\" data-end=\"10820\">\n<li data-section-id=\"16hq76o\" data-start=\"10716\" data-end=\"10725\">Airflow<\/li>\n<li data-section-id=\"ywzqn2\" data-start=\"10726\" data-end=\"10741\">Face velocity<\/li>\n<li data-section-id=\"1mlf30r\" data-start=\"10742\" data-end=\"10753\">Free area<\/li>\n<li data-section-id=\"d1yobo\" data-start=\"10754\" data-end=\"10769\">Pressure drop<\/li>\n<li data-section-id=\"1lp9bfd\" data-start=\"10770\" data-end=\"10788\">Rain penetration<\/li>\n<li data-section-id=\"3ic6c5\" data-start=\"10789\" data-end=\"10799\">Location<\/li>\n<li data-section-id=\"on4up\" data-start=\"10800\" data-end=\"10820\">Maintenance access<\/li>\n<\/ul>\n<hr data-start=\"10822\" data-end=\"10825\" \/>\n<h2 dir=\"auto\" data-section-id=\"1gemetm\" data-start=\"10827\" data-end=\"10861\"><span class=\"ez-toc-section\" id=\"Grille_vs_Louver_for_Exhaust_Air\"><\/span>Grille vs Louver for Exhaust Air<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"10863\" data-end=\"10937\">For external exhaust discharge, a suitable <strong data-start=\"10906\" data-end=\"10924\">exhaust louver<\/strong> may be used.<\/p>\n<p dir=\"auto\" data-start=\"10939\" data-end=\"10966\"><strong>The design should consider:<\/strong><\/p>\n<ul data-start=\"10968\" data-end=\"11118\">\n<li data-section-id=\"1qrxm3q\" data-start=\"10968\" data-end=\"10985\">Exhaust airflow<\/li>\n<li data-section-id=\"1h1ainv\" data-start=\"10986\" data-end=\"11006\">Discharge velocity<\/li>\n<li data-section-id=\"d1yobo\" data-start=\"11007\" data-end=\"11022\">Pressure drop<\/li>\n<li data-section-id=\"1620458\" data-start=\"11023\" data-end=\"11040\">Wind conditions<\/li>\n<li data-section-id=\"8ttp0j\" data-start=\"11041\" data-end=\"11061\">Recirculation risk<\/li>\n<li data-section-id=\"1o6hsqy\" data-start=\"11062\" data-end=\"11094\">Location of nearby air intakes<\/li>\n<li data-section-id=\"ixw5az\" data-start=\"11095\" data-end=\"11118\">Building surroundings<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"11120\" data-end=\"11286\">For industrial or contaminated-air applications, the exhaust arrangement should be designed according to the specific contaminant and applicable project requirements.<\/p>\n<hr data-start=\"11288\" data-end=\"11291\" \/>\n<h2 dir=\"auto\" data-section-id=\"1dyc6o9\" data-start=\"11293\" data-end=\"11328\"><span class=\"ez-toc-section\" id=\"Can_a_Louver_Be_Used_as_a_Grille\"><\/span>Can a Louver Be Used as a Grille?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"11330\" data-end=\"11442\">Sometimes the terminology can overlap, but <strong data-start=\"11373\" data-end=\"11441\">you should not assume that every louver can replace every grille<\/strong>.<\/p>\n<p dir=\"auto\" data-start=\"11444\" data-end=\"11611\">ASHRAE itself uses specific categories for grilles, diffusers and nozzle\/drum-louver devices depending on their airflow function.<\/p>\n<p dir=\"auto\" data-start=\"11613\" data-end=\"11639\"><strong>The important question is:<\/strong><\/p>\n<blockquote data-start=\"11641\" data-end=\"11685\">\n<p dir=\"auto\" data-start=\"11643\" data-end=\"11685\"><strong data-start=\"11643\" data-end=\"11685\">What is the required airflow function?<\/strong><\/p>\n<\/blockquote>\n<p dir=\"auto\" data-start=\"11687\" data-end=\"11771\">If you need indoor supply-air distribution, a grille or diffuser may be appropriate.<\/p>\n<p dir=\"auto\" data-start=\"11773\" data-end=\"11851\">If you need an exterior fresh-air intake, an intake louver may be appropriate.<\/p>\n<p dir=\"auto\" data-start=\"11853\" data-end=\"11921\">If you need exhaust discharge, an exhaust louver may be appropriate.<\/p>\n<hr data-start=\"11923\" data-end=\"11926\" \/>\n<h2 dir=\"auto\" data-section-id=\"1qp4zzu\" data-start=\"11928\" data-end=\"11973\"><span class=\"ez-toc-section\" id=\"Can_a_Grille_Be_Used_as_an_External_Louver\"><\/span>Can a Grille Be Used as an External Louver?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"11975\" data-end=\"12069\">A standard interior grille should <strong data-start=\"12009\" data-end=\"12068\">not automatically be substituted for an exterior louver<\/strong>.<\/p>\n<p dir=\"auto\" data-start=\"12071\" data-end=\"12121\"><strong>An external louver may need features that address:<\/strong><\/p>\n<ul data-start=\"12123\" data-end=\"12204\">\n<li data-section-id=\"1j4eem4\" data-start=\"12123\" data-end=\"12129\">Rain<\/li>\n<li data-section-id=\"1j4gg3g\" data-start=\"12130\" data-end=\"12136\">Wind<\/li>\n<li data-section-id=\"1wm1vur\" data-start=\"12137\" data-end=\"12155\">Outdoor exposure<\/li>\n<li data-section-id=\"11rriz4\" data-start=\"12156\" data-end=\"12167\">Corrosion<\/li>\n<li data-section-id=\"trftb1\" data-start=\"12168\" data-end=\"12177\">Insects<\/li>\n<li data-section-id=\"paumu3\" data-start=\"12178\" data-end=\"12188\">Drainage<\/li>\n<li data-section-id=\"d1yobo\" data-start=\"12189\" data-end=\"12204\">Pressure drop<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"12206\" data-end=\"12315\">Therefore, the component should be selected according to the application and manufacturer&#8217;s performance data.<\/p>\n<hr data-start=\"12317\" data-end=\"12320\" \/>\n<h2 dir=\"auto\" data-section-id=\"1q6j76j\" data-start=\"12322\" data-end=\"12362\"><span class=\"ez-toc-section\" id=\"Grille_vs_Louver_Which_One_Is_Better\"><\/span>Grille vs Louver: Which One Is Better?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"12364\" data-end=\"12393\">There is no universal winner.<\/p>\n<p dir=\"auto\" data-start=\"12395\" data-end=\"12441\">The correct choice depends on the application.<\/p>\n<h3 dir=\"auto\" data-section-id=\"g18ckk\" data-start=\"12443\" data-end=\"12477\">Choose a grille when you need:<\/h3>\n<ul data-start=\"12479\" data-end=\"12612\">\n<li data-section-id=\"r5co2v\" data-start=\"12479\" data-end=\"12511\">Indoor supply-air distribution<\/li>\n<li data-section-id=\"1tihgv7\" data-start=\"12512\" data-end=\"12535\">Return-air collection<\/li>\n<li data-section-id=\"mvcc0v\" data-start=\"12536\" data-end=\"12552\">Indoor exhaust<\/li>\n<li data-section-id=\"uvxqjz\" data-start=\"12553\" data-end=\"12582\">Directional airflow control<\/li>\n<li data-section-id=\"urqyrc\" data-start=\"12583\" data-end=\"12612\">Architectural air terminals<\/li>\n<\/ul>\n<h3 dir=\"auto\" data-section-id=\"15yng70\" data-start=\"12614\" data-end=\"12650\">Consider a louver when you need:<\/h3>\n<ul data-start=\"12652\" data-end=\"12787\">\n<li data-section-id=\"1igmatt\" data-start=\"12652\" data-end=\"12678\">Outdoor fresh-air intake<\/li>\n<li data-section-id=\"q0mjtf\" data-start=\"12679\" data-end=\"12697\">External exhaust<\/li>\n<li data-section-id=\"1s9p8fn\" data-start=\"12698\" data-end=\"12718\">Weather protection<\/li>\n<li data-section-id=\"11xnjk0\" data-start=\"12719\" data-end=\"12748\">Mechanical-room ventilation<\/li>\n<li data-section-id=\"1r0la5k\" data-start=\"12749\" data-end=\"12787\">Building fa\u00e7ade ventilation openings<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"12789\" data-end=\"12815\"><strong>So the better question is:<\/strong><\/p>\n<blockquote data-start=\"12817\" data-end=\"12908\">\n<p dir=\"auto\" data-start=\"12819\" data-end=\"12908\"><strong data-start=\"12819\" data-end=\"12908\">Which air terminal is appropriate for the airflow function and installation location?<\/strong><\/p>\n<\/blockquote>\n<hr data-start=\"12910\" data-end=\"12913\" \/>\n<h2 dir=\"auto\" data-section-id=\"1u9hqfl\" data-start=\"12915\" data-end=\"12959\"><span class=\"ez-toc-section\" id=\"How_to_Select_the_Correct_Grille_or_Louver\"><\/span>How to Select the Correct Grille or Louver<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"12961\" data-end=\"13003\"><strong>Before selecting the component, determine:<\/strong><\/p>\n<h3 dir=\"auto\" data-section-id=\"1ebfyr6\" data-start=\"13005\" data-end=\"13018\">1. Airflow<\/h3>\n<p dir=\"auto\" data-start=\"13020\" data-end=\"13049\">What is the required <strong data-start=\"13041\" data-end=\"13048\">CFM<\/strong>?<\/p>\n<h3 dir=\"auto\" data-section-id=\"1q5nuyr\" data-start=\"13051\" data-end=\"13068\">2. Application<\/h3>\n<p dir=\"auto\" data-start=\"13070\" data-end=\"13076\"><strong>Is it:<\/strong><\/p>\n<ul data-start=\"13078\" data-end=\"13121\">\n<li data-section-id=\"1lc2wis\" data-start=\"13078\" data-end=\"13087\">Supply?<\/li>\n<li data-section-id=\"jvvfct\" data-start=\"13088\" data-end=\"13097\">Return?<\/li>\n<li data-section-id=\"gse9ap\" data-start=\"13098\" data-end=\"13108\">Exhaust?<\/li>\n<li data-section-id=\"9mmxtz\" data-start=\"13109\" data-end=\"13121\">Fresh air?<\/li>\n<\/ul>\n<h3 dir=\"auto\" data-section-id=\"1vqsbnp\" data-start=\"13123\" data-end=\"13137\">3. Location<\/h3>\n<p dir=\"auto\" data-start=\"13139\" data-end=\"13153\"><strong>Is the device:<\/strong><\/p>\n<ul data-start=\"13155\" data-end=\"13213\">\n<li data-section-id=\"tgq13a\" data-start=\"13155\" data-end=\"13164\">Indoor?<\/li>\n<li data-section-id=\"aa6a8f\" data-start=\"13165\" data-end=\"13175\">Outdoor?<\/li>\n<li data-section-id=\"wpxtzo\" data-start=\"13176\" data-end=\"13186\">Ceiling?<\/li>\n<li data-section-id=\"17bf4qp\" data-start=\"13187\" data-end=\"13194\">Wall?<\/li>\n<li data-section-id=\"1y1pvxr\" data-start=\"13195\" data-end=\"13203\">Floor?<\/li>\n<li data-section-id=\"16t80wn\" data-start=\"13204\" data-end=\"13213\">Fa\u00e7ade?<\/li>\n<\/ul>\n<h3 dir=\"auto\" data-section-id=\"698njm\" data-start=\"13215\" data-end=\"13233\">4. Air Velocity<\/h3>\n<p dir=\"auto\" data-start=\"13235\" data-end=\"13268\">What face velocity is acceptable?<\/p>\n<h3 dir=\"auto\" data-section-id=\"10v1nma\" data-start=\"13270\" data-end=\"13289\">5. Pressure Drop<\/h3>\n<p dir=\"auto\" data-start=\"13291\" data-end=\"13341\">What pressure drop can the fan system accommodate?<\/p>\n<h3 dir=\"auto\" data-section-id=\"c8w30j\" data-start=\"13343\" data-end=\"13354\">6. Noise<\/h3>\n<p dir=\"auto\" data-start=\"13356\" data-end=\"13369\"><strong>Is the space:<\/strong><\/p>\n<ul data-start=\"13371\" data-end=\"13429\">\n<li data-section-id=\"1q165h3\" data-start=\"13371\" data-end=\"13380\">Office?<\/li>\n<li data-section-id=\"1k0ublv\" data-start=\"13381\" data-end=\"13392\">Hospital?<\/li>\n<li data-section-id=\"1mvzzkd\" data-start=\"13393\" data-end=\"13401\">Hotel?<\/li>\n<li data-section-id=\"ydzy5s\" data-start=\"13402\" data-end=\"13415\">Industrial?<\/li>\n<li data-section-id=\"jgud96\" data-start=\"13416\" data-end=\"13429\">Restaurant?<\/li>\n<\/ul>\n<h3 dir=\"auto\" data-section-id=\"11v7lkn\" data-start=\"13431\" data-end=\"13453\">7. Weather Exposure<\/h3>\n<p dir=\"auto\" data-start=\"13455\" data-end=\"13486\"><strong>For external louvers, evaluate:<\/strong><\/p>\n<ul data-start=\"13488\" data-end=\"13520\">\n<li data-section-id=\"1j4eem4\" data-start=\"13488\" data-end=\"13494\">Rain<\/li>\n<li data-section-id=\"1j4gg3g\" data-start=\"13495\" data-end=\"13501\">Wind<\/li>\n<li data-section-id=\"1j40wse\" data-start=\"13502\" data-end=\"13508\">Dust<\/li>\n<li data-section-id=\"11rriz4\" data-start=\"13509\" data-end=\"13520\">Corrosion<\/li>\n<\/ul>\n<h3 dir=\"auto\" data-section-id=\"1864lp4\" data-start=\"13522\" data-end=\"13536\">8. Material<\/h3>\n<p dir=\"auto\" data-start=\"13538\" data-end=\"13565\"><strong>Possible materials include:<\/strong><\/p>\n<ul data-start=\"13567\" data-end=\"13653\">\n<li data-section-id=\"fto2i3\" data-start=\"13567\" data-end=\"13578\">Aluminium<\/li>\n<li data-section-id=\"xslx8j\" data-start=\"13579\" data-end=\"13600\">GI\/galvanized steel<\/li>\n<li data-section-id=\"18g4t1n\" data-start=\"13601\" data-end=\"13618\">Stainless steel<\/li>\n<li data-section-id=\"1cas47g\" data-start=\"13619\" data-end=\"13653\">Other project-specific materials<\/li>\n<\/ul>\n<h3 dir=\"auto\" data-section-id=\"1njas4s\" data-start=\"13655\" data-end=\"13680\">9. Blade Configuration<\/h3>\n<p dir=\"auto\" data-start=\"13682\" data-end=\"13691\"><strong>Consider:<\/strong><\/p>\n<ul data-start=\"13693\" data-end=\"13792\">\n<li data-section-id=\"15bkckw\" data-start=\"13693\" data-end=\"13706\">Fixed blade<\/li>\n<li data-section-id=\"qk8z3l\" data-start=\"13707\" data-end=\"13725\">Adjustable blade<\/li>\n<li data-section-id=\"3tyt1f\" data-start=\"13726\" data-end=\"13745\">Single deflection<\/li>\n<li data-section-id=\"1teiqcs\" data-start=\"13746\" data-end=\"13765\">Double deflection<\/li>\n<li data-section-id=\"m29e4y\" data-start=\"13766\" data-end=\"13792\">Drainable\/weather louver<\/li>\n<\/ul>\n<h3 dir=\"auto\" data-section-id=\"1npl2s7\" data-start=\"13794\" data-end=\"13812\">10. Maintenance<\/h3>\n<p dir=\"auto\" data-start=\"13814\" data-end=\"13832\"><strong>Ensure access for:<\/strong><\/p>\n<ul data-start=\"13834\" data-end=\"13916\">\n<li data-section-id=\"bb6lsd\" data-start=\"13834\" data-end=\"13844\">Cleaning<\/li>\n<li data-section-id=\"qf9l7a\" data-start=\"13845\" data-end=\"13857\">Inspection<\/li>\n<li data-section-id=\"29h9th\" data-start=\"13858\" data-end=\"13895\">Filter maintenance where applicable<\/li>\n<li data-section-id=\"1ld7au2\" data-start=\"13896\" data-end=\"13916\">Damper maintenance<\/li>\n<\/ul>\n<hr data-start=\"13918\" data-end=\"13921\" \/>\n<h2 dir=\"auto\" data-section-id=\"frxoad\" data-start=\"13923\" data-end=\"13968\"><span class=\"ez-toc-section\" id=\"Grille_and_Louver_in_a_Complete_HVAC_System\"><\/span>Grille and Louver in a Complete HVAC System<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"13970\" data-end=\"14032\">A commercial HVAC system may use <strong data-start=\"14003\" data-end=\"14031\">both grilles and louvers<\/strong>.<\/p>\n<p dir=\"auto\" data-start=\"14034\" data-end=\"14046\"><strong>For example:<\/strong><\/p>\n<h3 dir=\"auto\" data-section-id=\"osn1zn\" data-start=\"14048\" data-end=\"14068\">Fresh Air System<\/h3>\n<p dir=\"auto\" data-start=\"14070\" data-end=\"14134\"><strong data-start=\"14070\" data-end=\"14134\">Outdoor \u2192 Intake Louver \u2192 FAHU \u2192 Supply Duct \u2192 Grille \u2192 Room<\/strong><\/p>\n<h3 dir=\"auto\" data-section-id=\"1xvi0yb\" data-start=\"14136\" data-end=\"14157\">Return Air System<\/h3>\n<p dir=\"auto\" data-start=\"14159\" data-end=\"14203\"><strong data-start=\"14159\" data-end=\"14203\">Room \u2192 Return Grille \u2192 Return Duct \u2192 AHU<\/strong><\/p>\n<h3 dir=\"auto\" data-section-id=\"1el7sth\" data-start=\"14205\" data-end=\"14223\">Exhaust System<\/h3>\n<p dir=\"auto\" data-start=\"14225\" data-end=\"14297\"><strong data-start=\"14225\" data-end=\"14297\">Room \u2192 Exhaust Grille \u2192 Exhaust Duct \u2192 Exhaust Fan \u2192 External Louver<\/strong><\/p>\n<p dir=\"auto\" data-start=\"14299\" data-end=\"14369\">Therefore, grilles and louvers are not necessarily competing products.<\/p>\n<p dir=\"auto\" data-start=\"14371\" data-end=\"14436\">They can be <strong data-start=\"14383\" data-end=\"14435\">different components within the same HVAC system<\/strong>.<\/p>\n<hr data-start=\"14438\" data-end=\"14441\" \/>\n<h2 dir=\"auto\" data-section-id=\"17ucvat\" data-start=\"14443\" data-end=\"14499\"><span class=\"ez-toc-section\" id=\"Grilles_Louvers_and_Diffusers_Whats_the_Difference\"><\/span>Grilles, Louvers and Diffusers: What&#8217;s the Difference?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"14501\" data-end=\"14552\">There is often confusion between these three terms.<\/p>\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: 137px;\" width=\"735\" data-start=\"14554\" data-end=\"14781\">\n<thead data-start=\"14554\" data-end=\"14586\">\n<tr data-start=\"14554\" data-end=\"14586\">\n<th class=\"last:pe-10\" data-start=\"14554\" data-end=\"14566\" data-col-size=\"sm\">Component<\/th>\n<th class=\"last:pe-10\" data-start=\"14566\" data-end=\"14586\" data-col-size=\"md\">Primary Function<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"14597\" data-end=\"14781\">\n<tr data-start=\"14597\" data-end=\"14639\">\n<td data-start=\"14597\" data-end=\"14606\" data-col-size=\"sm\">Grille<\/td>\n<td data-start=\"14606\" data-end=\"14639\" data-col-size=\"md\">Supply, return or exhaust air<\/td>\n<\/tr>\n<tr data-start=\"14640\" data-end=\"14698\">\n<td data-start=\"14640\" data-end=\"14649\" data-col-size=\"sm\">Louver<\/td>\n<td data-start=\"14649\" data-end=\"14698\" data-col-size=\"md\">Outdoor intake\/exhaust and weather protection<\/td>\n<\/tr>\n<tr data-start=\"14699\" data-end=\"14781\">\n<td data-start=\"14699\" data-end=\"14710\" data-col-size=\"sm\">Diffuser<\/td>\n<td data-start=\"14710\" data-end=\"14781\" data-col-size=\"md\">Designed to distribute air and promote mixing in the occupied space<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p dir=\"auto\" data-start=\"14783\" data-end=\"14965\">ASHRAE identifies grilles and diffusers as different categories of air-distribution equipment, with different applications and airflow patterns.<\/p>\n<p dir=\"auto\" data-start=\"14967\" data-end=\"15164\">VIPUL&#8217;s ductwork offering includes <strong data-start=\"15002\" data-end=\"15087\">dampers, grilles, diffusers, slot diffusers, square diffusers and round diffusers<\/strong> as part of air-distribution systems.<\/p>\n<hr data-start=\"15166\" data-end=\"15169\" \/>\n<h2 dir=\"auto\" data-section-id=\"4n3hf1\" data-start=\"15171\" data-end=\"15223\"><span class=\"ez-toc-section\" id=\"Common_Mistakes_When_Selecting_Grilles_and_Louvers\"><\/span>Common Mistakes When Selecting Grilles and Louvers<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 dir=\"auto\" data-section-id=\"17j4n3f\" data-start=\"15225\" data-end=\"15267\">Mistake 1: Selecting Based Only on Size<\/h3>\n<p dir=\"auto\" data-start=\"15269\" data-end=\"15345\">A 600 \u00d7 600 mm grille does not automatically mean it can handle any airflow.<\/p>\n<p dir=\"auto\" data-start=\"15347\" data-end=\"15383\">Airflow and performance data matter.<\/p>\n<h3 dir=\"auto\" data-section-id=\"xng6og\" data-start=\"15385\" data-end=\"15421\">Mistake 2: Ignoring Pressure Drop<\/h3>\n<p dir=\"auto\" data-start=\"15423\" data-end=\"15492\">High pressure drop can affect fan performance and energy consumption.<\/p>\n<h3 dir=\"auto\" data-section-id=\"92bsa2\" data-start=\"15494\" data-end=\"15539\">Mistake 3: Using an Indoor Grille Outdoors<\/h3>\n<p dir=\"auto\" data-start=\"15541\" data-end=\"15623\">Outdoor applications require appropriate weather and environmental considerations.<\/p>\n<h3 dir=\"auto\" data-section-id=\"1e766sk\" data-start=\"15625\" data-end=\"15653\">Mistake 4: Ignoring Noise<\/h3>\n<p dir=\"auto\" data-start=\"15655\" data-end=\"15702\">A high face velocity may create unwanted noise.<\/p>\n<h3 dir=\"auto\" data-section-id=\"1e9gypn\" data-start=\"15704\" data-end=\"15743\">Mistake 5: Ignoring Air Distribution<\/h3>\n<p dir=\"auto\" data-start=\"15745\" data-end=\"15854\">A correctly sized grille can still produce poor comfort if its throw and discharge pattern are inappropriate.<\/p>\n<h3 dir=\"auto\" data-section-id=\"l0xwpx\" data-start=\"15856\" data-end=\"15890\">Mistake 6: Ignoring Maintenance<\/h3>\n<p dir=\"auto\" data-start=\"15892\" data-end=\"15957\">The component must remain accessible for cleaning and inspection.<\/p>\n<h3 dir=\"auto\" data-section-id=\"1910rcx\" data-start=\"15959\" data-end=\"16010\">Mistake 7: Selecting Without Airflow Calculation<\/h3>\n<p dir=\"auto\" data-start=\"16012\" data-end=\"16074\">The required CFM should be established before final selection.<\/p>\n<hr data-start=\"16076\" data-end=\"16079\" \/>\n<h2 dir=\"auto\" data-section-id=\"1porw4t\" data-start=\"16081\" data-end=\"16122\"><span class=\"ez-toc-section\" id=\"Why_Grille_and_Louver_Selection_Matters\"><\/span>Why Grille and Louver Selection Matters<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"16124\" data-end=\"16185\"><strong>A properly designed air-distribution system can help achieve:<\/strong><\/p>\n<ul data-start=\"16187\" data-end=\"16380\">\n<li data-section-id=\"16zun8w\" data-start=\"16187\" data-end=\"16203\">Better airflow<\/li>\n<li data-section-id=\"107mcmr\" data-start=\"16204\" data-end=\"16230\">Improved thermal comfort<\/li>\n<li data-section-id=\"3io3t5\" data-start=\"16231\" data-end=\"16255\">Appropriate air mixing<\/li>\n<li data-section-id=\"1ch6kpn\" data-start=\"16256\" data-end=\"16279\">Lower pressure losses<\/li>\n<li data-section-id=\"1gcy3v6\" data-start=\"16280\" data-end=\"16295\">Reduced noise<\/li>\n<li data-section-id=\"53etwc\" data-start=\"16296\" data-end=\"16321\">Better HVAC performance<\/li>\n<li data-section-id=\"fvglwn\" data-start=\"16322\" data-end=\"16344\">Improved ventilation<\/li>\n<li data-section-id=\"nsoyu2\" data-start=\"16345\" data-end=\"16380\">More predictable system operation<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"16382\" data-end=\"16549\">ASHRAE emphasizes that selection and placement of air outlets should consider the airflow pattern and occupant thermal comfort.<\/p>\n<hr data-start=\"16551\" data-end=\"16554\" \/>\n<h2 dir=\"auto\" data-section-id=\"3di5h4\" data-start=\"16556\" data-end=\"16599\"><span class=\"ez-toc-section\" id=\"Grille_and_Louver_Solutions_by_VIPUL_HVAC\"><\/span>Grille and Louver Solutions by VIPUL HVAC<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"16601\" data-end=\"16743\">VIPUL HVAC Solution Pvt. Ltd. provides HVAC ductwork and air-distribution solutions for commercial, industrial and institutional applications.<\/p>\n<p dir=\"auto\" data-start=\"16745\" data-end=\"16775\"><strong>Its ductwork services include:<\/strong><\/p>\n<ul data-start=\"16777\" data-end=\"16999\">\n<li data-section-id=\"g9izto\" data-start=\"16777\" data-end=\"16790\">Duct design<\/li>\n<li data-section-id=\"1majaan\" data-start=\"16791\" data-end=\"16806\">Shop drawings<\/li>\n<li data-section-id=\"150dff2\" data-start=\"16807\" data-end=\"16825\">Duct fabrication<\/li>\n<li data-section-id=\"kh1rf6\" data-start=\"16826\" data-end=\"16845\">Duct installation<\/li>\n<li data-section-id=\"1s1t4xd\" data-start=\"16846\" data-end=\"16861\">Air balancing<\/li>\n<li data-section-id=\"19quzku\" data-start=\"16862\" data-end=\"16871\">Testing<\/li>\n<li data-section-id=\"lrizoz\" data-start=\"16872\" data-end=\"16892\">Thermal insulation<\/li>\n<li data-section-id=\"r0t1g9\" data-start=\"16893\" data-end=\"16913\">Acoustic treatment<\/li>\n<li data-section-id=\"1pppl04\" data-start=\"16914\" data-end=\"16923\">Dampers<\/li>\n<li data-section-id=\"wf0wea\" data-start=\"16924\" data-end=\"16933\">Grilles<\/li>\n<li data-section-id=\"108jplz\" data-start=\"16934\" data-end=\"16945\">Diffusers<\/li>\n<li data-section-id=\"rmnkxv\" data-start=\"16946\" data-end=\"16962\">Slot diffusers<\/li>\n<li data-section-id=\"ra8jnq\" data-start=\"16963\" data-end=\"16981\">Square diffusers<\/li>\n<li data-section-id=\"1qy6ayt\" data-start=\"16982\" data-end=\"16999\">Round diffusers<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"17001\" data-end=\"17172\">VIPUL&#8217;s official ductwork page describes duct systems designed for balanced airflow, reduced losses and efficient HVAC performance.<\/p>\n<p dir=\"auto\" data-start=\"17174\" data-end=\"17228\"><strong>For ventilation projects, the company also works with:<\/strong><\/p>\n<ul data-start=\"17230\" data-end=\"17413\">\n<li data-section-id=\"bfmntb\" data-start=\"17230\" data-end=\"17256\">Fresh-air handling units<\/li>\n<li data-section-id=\"1oje9ep\" data-start=\"17257\" data-end=\"17270\">Supply fans<\/li>\n<li data-section-id=\"1oy3fdg\" data-start=\"17271\" data-end=\"17285\">Exhaust fans<\/li>\n<li data-section-id=\"14es0pn\" data-start=\"17286\" data-end=\"17295\">Filters<\/li>\n<li data-section-id=\"1pppl04\" data-start=\"17296\" data-end=\"17305\">Dampers<\/li>\n<li data-section-id=\"1fbgpbc\" data-start=\"17306\" data-end=\"17329\">Heat-recovery systems<\/li>\n<li data-section-id=\"7ureu7\" data-start=\"17330\" data-end=\"17343\">VAV systems<\/li>\n<li data-section-id=\"r0fp1g\" data-start=\"17344\" data-end=\"17413\">Air-distribution components<\/li>\n<\/ul>\n<hr data-start=\"17415\" data-end=\"17418\" \/>\n<h2 dir=\"auto\" data-section-id=\"57k58o\" data-start=\"17420\" data-end=\"17444\"><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=\"17446\" data-end=\"17600\">For a professional HVAC project, selecting a grille or louver should be part of the overall <strong data-start=\"17538\" data-end=\"17565\">air-distribution design<\/strong>, not an isolated product decision.<\/p>\n<p dir=\"auto\" data-start=\"17602\" data-end=\"17644\"><strong>VIPUL HVAC can support projects involving:<\/strong><\/p>\n<ul data-start=\"17646\" data-end=\"17900\">\n<li data-section-id=\"uoi2w6\" data-start=\"17646\" data-end=\"17659\">HVAC design<\/li>\n<li data-section-id=\"ja7nxd\" data-start=\"17660\" data-end=\"17684\">Heat-load calculations<\/li>\n<li data-section-id=\"1j8ajh\" data-start=\"17685\" data-end=\"17702\">Ductwork design<\/li>\n<li data-section-id=\"1lcfes8\" data-start=\"17703\" data-end=\"17730\">Air-distribution planning<\/li>\n<li data-section-id=\"1x76ywz\" data-start=\"17731\" data-end=\"17750\">Fresh-air systems<\/li>\n<li data-section-id=\"1jmnkmw\" data-start=\"17751\" data-end=\"17768\">Exhaust systems<\/li>\n<li data-section-id=\"1j41sqv\" data-start=\"17769\" data-end=\"17775\">AHUs<\/li>\n<li data-section-id=\"171jbi9\" data-start=\"17776\" data-end=\"17783\">FAHUs<\/li>\n<li data-section-id=\"asz7lb\" data-start=\"17784\" data-end=\"17805\">Ventilation systems<\/li>\n<li data-section-id=\"cs8vye\" data-start=\"17806\" data-end=\"17829\">Grilles and diffusers<\/li>\n<li data-section-id=\"1pppl04\" data-start=\"17830\" data-end=\"17839\">Dampers<\/li>\n<li data-section-id=\"1s1t4xd\" data-start=\"17840\" data-end=\"17855\">Air balancing<\/li>\n<li data-section-id=\"19quzku\" data-start=\"17856\" data-end=\"17865\">Testing<\/li>\n<li data-section-id=\"akz4v9\" data-start=\"17866\" data-end=\"17881\">Commissioning<\/li>\n<li data-section-id=\"qgmbt5\" data-start=\"17882\" data-end=\"17900\">HVAC maintenance<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"17902\" data-end=\"18053\">The company provides HVAC engineering and project execution support for commercial and industrial applications.<\/p>\n<hr data-start=\"18055\" data-end=\"18058\" \/>\n<h2 dir=\"auto\" data-section-id=\"hkd5a4\" data-start=\"18060\" data-end=\"18088\"><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=\"17q1py8\" data-start=\"18090\" data-end=\"18151\">What is the main difference between a grille and a louver?<\/h3>\n<p dir=\"auto\" data-start=\"18153\" data-end=\"18341\">A grille is commonly used as an indoor air terminal for supply, return or exhaust air, while a louver is commonly used for outdoor air intake or exhaust and may provide weather protection.<\/p>\n<h3 dir=\"auto\" data-section-id=\"13dbfof\" data-start=\"18343\" data-end=\"18379\">Is a grille the same as a louver?<\/h3>\n<p dir=\"auto\" data-start=\"18381\" data-end=\"18491\">No. Although their blade construction can look similar, their design purpose and application can be different.<\/p>\n<h3 dir=\"auto\" data-section-id=\"pcbcw\" data-start=\"18493\" data-end=\"18531\">Which is used for fresh-air intake?<\/h3>\n<p dir=\"auto\" data-start=\"18533\" data-end=\"18629\">An appropriately designed <strong data-start=\"18559\" data-end=\"18586\">fresh-air intake louver<\/strong> is commonly used for outdoor-air openings.<\/p>\n<h3 dir=\"auto\" data-section-id=\"fkpydt\" data-start=\"18631\" data-end=\"18663\">Which is used for return air?<\/h3>\n<p dir=\"auto\" data-start=\"18665\" data-end=\"18777\">A <strong data-start=\"18667\" data-end=\"18688\">return-air grille<\/strong> is commonly used to collect air from an occupied space and return it to the HVAC system.<\/p>\n<h3 dir=\"auto\" data-section-id=\"ceztf7\" data-start=\"18779\" data-end=\"18815\">Can a grille be used for exhaust?<\/h3>\n<p dir=\"auto\" data-start=\"18817\" data-end=\"18895\">Yes. Grilles can be used for exhaust-air applications depending on the design.<\/p>\n<h3 dir=\"auto\" data-section-id=\"11z57lp\" data-start=\"18897\" data-end=\"18933\">Can a louver be used for exhaust?<\/h3>\n<p dir=\"auto\" data-start=\"18935\" data-end=\"19021\">Yes. Exhaust louvers are commonly used for outdoor discharge from ventilation systems.<\/p>\n<h3 dir=\"auto\" data-section-id=\"18oc0s2\" data-start=\"19023\" data-end=\"19060\">Which is better, grille or louver?<\/h3>\n<p dir=\"auto\" data-start=\"19062\" data-end=\"19208\">Neither is universally better. The correct choice depends on airflow function, location, weather exposure, pressure drop, noise and system design.<\/p>\n<h3 dir=\"auto\" data-section-id=\"1y8t54e\" data-start=\"19210\" data-end=\"19271\">What information is required to select a grille or louver?<\/h3>\n<p dir=\"auto\" data-start=\"19273\" data-end=\"19445\">Important parameters include <strong data-start=\"19302\" data-end=\"19444\">airflow\/CFM, installation location, face velocity, pressure drop, airflow pattern, noise requirements, material and environmental exposure<\/strong>.<\/p>\n<h3 dir=\"auto\" data-section-id=\"7hdh0w\" data-start=\"19447\" data-end=\"19491\">Are grilles and louvers part of ductwork?<\/h3>\n<p dir=\"auto\" data-start=\"19493\" data-end=\"19633\">They can be. They are commonly connected to or integrated with ductwork and form part of the overall air-distribution or ventilation system.<\/p>\n<hr data-start=\"19635\" data-end=\"19638\" \/>\n<h2 dir=\"auto\" data-section-id=\"fsb6xx\" data-start=\"19640\" data-end=\"19652\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"19654\" data-end=\"19774\">The difference between a <strong data-start=\"19679\" data-end=\"19702\">grille and a louver<\/strong> is primarily related to <strong data-start=\"19727\" data-end=\"19773\">application, location and airflow function<\/strong>.<\/p>\n<h3 dir=\"auto\" data-section-id=\"cdg18f\" data-start=\"19776\" data-end=\"19786\">Grille<\/h3>\n<p dir=\"auto\" data-start=\"19788\" data-end=\"19858\"><strong data-start=\"19788\" data-end=\"19858\">Mainly used for indoor supply, return or exhaust air distribution.<\/strong><\/p>\n<h3 dir=\"auto\" data-section-id=\"lmme0h\" data-start=\"19860\" data-end=\"19870\">Louver<\/h3>\n<p dir=\"auto\" data-start=\"19872\" data-end=\"19988\"><strong data-start=\"19872\" data-end=\"19988\">Commonly used for outdoor air intake, exhaust and ventilation openings, often with weather-related requirements.<\/strong><\/p>\n<p dir=\"auto\" data-start=\"19990\" data-end=\"20173\">A professional HVAC design should consider <strong data-start=\"20033\" data-end=\"20138\">CFM, face velocity, pressure drop, airflow pattern, noise, location, weather exposure and maintenance<\/strong> before selecting either component.<\/p>\n<p dir=\"auto\" data-start=\"20175\" data-end=\"20349\">In many HVAC projects, you don&#8217;t have to choose between the two\u2014<strong data-start=\"20239\" data-end=\"20349\">the same building may require both grilles and louvers at different points in the air-distribution system.<\/strong><\/p>\n<p dir=\"auto\" data-start=\"20351\" data-end=\"20433\"><strong data-start=\"20351\" data-end=\"20433\">Need HVAC ductwork, ventilation, grille, louver or air-distribution solutions?<\/strong><\/p>\n<h3 dir=\"auto\" data-section-id=\"lwimkb\" data-start=\"20435\" data-end=\"20476\">Contact VIPUL HVAC Solution Pvt. Ltd.<\/h3>\n<p dir=\"auto\" data-start=\"20478\" data-end=\"20564\"><strong data-start=\"20478\" data-end=\"20499\">\ud83d\udcde +91 8000392000<\/strong><br data-start=\"20499\" data-end=\"20502\" \/><strong data-start=\"20502\" data-end=\"20534\">\ud83d\udce7 <a class=\"decorated-link cursor-pointer\" rel=\"noopener\" data-start=\"20507\" data-end=\"20532\">info@vipulhvacsolution.in<\/a><\/strong><br data-start=\"20534\" data-end=\"20537\" \/><strong data-start=\"20537\" data-end=\"20564\">\ud83c\udf10 <a href=\"https:\/\/vipulhvacsolution.in\/\">vipulhvacsolution.in<\/a><\/strong><\/p>\n<hr data-start=\"20566\" data-end=\"20569\" \/>\n<h3 dir=\"auto\" data-section-id=\"je53b\" data-start=\"21266\" data-end=\"21296\">Recommended Links:<\/h3>\n<ol data-start=\"21331\" data-end=\"21602\">\n<li data-section-id=\"1a4e46w\" data-start=\"21331\" data-end=\"21354\"><a href=\"https:\/\/vipulhvacsolution.in\/duct-work-system\/\"><strong data-start=\"21334\" data-end=\"21354\">Duct Work System<\/strong><\/a><\/li>\n<li data-section-id=\"1n974pp\" data-start=\"21355\" data-end=\"21390\"><a href=\"https:\/\/vipulhvacsolution.in\/ventilation-systems\/\"><strong data-start=\"21358\" data-end=\"21390\">Fresh Air Ventilation System<\/strong><\/a><\/li>\n<li data-section-id=\"10qx3v2\" data-start=\"21391\" data-end=\"21444\"><strong data-start=\"21394\" data-end=\"21444\">Fresh Air Ventilation System for Office &amp; Home<\/strong><\/li>\n<li data-section-id=\"1dkjzxe\" data-start=\"21445\" data-end=\"21476\"><a href=\"https:\/\/vipulac.in\/air-handling-unit\/\" target=\"_blank\" rel=\"noopener\"><strong data-start=\"21448\" data-end=\"21476\">Air Handling Units (AHU)<\/strong><\/a><\/li>\n<li data-section-id=\"119hzeg\" data-start=\"21477\" data-end=\"21513\"><a href=\"https:\/\/vipulhvacsolution.in\/blog\/hvac-turnkey-services-gujarat\/\"><strong data-start=\"21480\" data-end=\"21513\">HVAC Turnkey Services Gujarat<\/strong><\/a><\/li>\n<li data-section-id=\"lss29l\" data-start=\"21514\" data-end=\"21542\"><a href=\"https:\/\/vipulhvacsolution.in\/blog\/ahu-supplier-in-india\/\"><strong data-start=\"21517\" data-end=\"21542\">AHU Supplier in India<\/strong><\/a><\/li>\n<li data-section-id=\"16o9q52\" data-start=\"21543\" data-end=\"21575\"><a href=\"https:\/\/vipulhvacsolution.in\/commercial-hvac-solutions\/\"><strong data-start=\"21546\" data-end=\"21575\">Commercial HVAC Solutions<\/strong><\/a><\/li>\n<li data-section-id=\"1b0y8pg\" data-start=\"21576\" data-end=\"21602\"><a href=\"https:\/\/vipulhvacsolution.in\/ventilation-systems\/\"><strong data-start=\"21579\" data-end=\"21602\">Ventilation Systems<\/strong><\/a><\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>What Is the Difference Between Grille and Louver? Complete HVAC Guide If you are designing an HVAC, ventilation, fresh-air or exhaust system, you may come across two commonly used air-distribution components: grilles and louvers. Although both can have horizontal or vertical blades and may look similar, they are not necessarily designed for the same purpose. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":418,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-413","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hvac-solution"],"_links":{"self":[{"href":"https:\/\/vipulhvacsolution.in\/blog\/wp-json\/wp\/v2\/posts\/413","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=413"}],"version-history":[{"count":4,"href":"https:\/\/vipulhvacsolution.in\/blog\/wp-json\/wp\/v2\/posts\/413\/revisions"}],"predecessor-version":[{"id":417,"href":"https:\/\/vipulhvacsolution.in\/blog\/wp-json\/wp\/v2\/posts\/413\/revisions\/417"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vipulhvacsolution.in\/blog\/wp-json\/wp\/v2\/media\/418"}],"wp:attachment":[{"href":"https:\/\/vipulhvacsolution.in\/blog\/wp-json\/wp\/v2\/media?parent=413"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vipulhvacsolution.in\/blog\/wp-json\/wp\/v2\/categories?post=413"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vipulhvacsolution.in\/blog\/wp-json\/wp\/v2\/tags?post=413"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}