[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"globals_businessInfo":3,"blogPost_louver-free-area_entry":28,"get_announcements":75,"blogPost_louver-free-area_relatedPostsEntries":140,"theHeader_mainMenu":141,"theHeader_topMenu":185,"theHeader_siteTopBarCta":195},{"__typename":4,"businessInformation":5,"businessLinks":15},"businessInformationAndLink_Entry",[6],{"__typename":7,"typeHandle":8,"companyName":9,"address":10,"city":11,"zip":12,"state":13,"phone":14},"address_Entry","address","AWV","219 S. Church Street","Bowling Green","43402","OH","+1 419 865-5000",[16,22],{"__typename":17,"typeHandle":18,"twitterUrl":19,"linkedinUrl":20,"facebookUrl":21},"socialLinks_Entry","socialLinks",null,"https:\u002F\u002Fwww.linkedin.com\u002Fcompany\u002Famerican-warming-&-ventilating-a-mestek-company","https:\u002F\u002Fwww.facebook.com\u002FAWV.USA\u002F?ref=br_rs",{"__typename":23,"typeHandle":24,"termsOfUseLink":25,"termsAndConditionsLink":26,"portalLink":27},"termsLinks_Entry","termsLinks","https:\u002F\u002Fwww.mestek.com\u002FHome\u002FLegal","https:\u002F\u002Fwww.literature.mestek.com\u002Fdms\u002FAmericanWarmingVentilating\u002Ftc-2010-A(3)-2-25-10.pdf","https:\u002F\u002Fwww.salesassistant.com\u002F",{"__typename":29,"id":30,"title":31,"seoTitle":31,"seoDescription":32,"blogPostBodyContent":33,"blogPostFeaturedImage":34,"blogPostSidebarCta":38,"blogPostTags":60,"blogPostBannerImage":61,"blogPostBottomCta":62,"seomatic":69},"blogPost_Entry","6957","Louver Free Area Space: Finding the Right Balance","Louver free area space: Finding the right balance between energy use and airflow is critical to building a sound HVAC or exhaust system. Learn more.","\u003Cp dir=\"ltr\">Finding the right balance between energy use and airflow is critical to building a sound HVAC or exhaust system — that is where louvers come in handy. No building is complete without them, but it’s important to know that the way they are designed and installed dictates how well they will function. \u003Cbr \u002F>\u003C\u002Fp>\n\u003Ch2 dir=\"ltr\">What Is Free Area?\u003C\u002Fh2>\n\u003Cp dir=\"ltr\">The free area is the minimum area that air can pass through a louver. It is simply the total opening area that is unobstructed by blades and frame. Typically, higher free area will mean enhanced airflow, but it also allows for greater penetration of rainwater and debris. \u003C\u002Fp>\n\u003Cfigure class=\"image\">\u003Cimg src=\"https:\u002F\u002Fawv-cdn.nyc3.cdn.digitaloceanspaces.com\u002Fblog\u002F_transforms\u002F_blogPost\u002F6958\u002Fspohn-associates_closeup_lg.webp\" alt=\"Louver Free Area Space\" \u002F>\u003C\u002Ffigure>\n\u003Ch2 dir=\"ltr\">How to Calculate Free Area\u003C\u002Fh2>\n\u003Cp dir=\"ltr\">To calculate the free area, take the total open area (remove all obstructions, blade, and frame from the equation), and divide that figure by the area of the overall wall opening. This will give you a comparison of the louvered opening to the wall opening. \u003C\u002Fp>\n\u003Cp dir=\"ltr\">Free areas commonly range from 35% to 60% of the wall opening. \u003C\u002Fp>\n\u003Cp dir=\"ltr\">Typically, a bigger percentage is better since more air can enter through smaller wall openings, potentially reducing the overall costs. However, this has to be balanced against the water penetration that a higher free area likely brings. A well designed louver will maximize free area, while minimizing water penetration.\u003C\u002Fp>\n\u003Ch2 dir=\"ltr\">How Other Louver Factors Can Impact Free Area Performance\u003C\u002Fh2>\n\u003Cp dir=\"ltr\">It is important to remember that free areas differ by size, shape, screens, and the model of the louver used. These factors can have a considerable impact on the free area you get, so make sure you consider all of the factors when selecting the louvers for your building.\u003C\u002Fp>\n\u003Ch3 dir=\"ltr\">\u003Cstrong>Orientation\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp dir=\"ltr\">A louver that is 4 ft wide by 8 ft high may not have the same free area as a louver that is 8ft wide by 4 ft high. \u003C\u002Fp>\n\u003Ch3 dir=\"ltr\">\u003Cstrong>Size\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp dir=\"ltr\">Also, the smaller your louver becomes, the greater the space taken up by the louver frame, thus reducing your louver free area percentage. Most people assume that free area is fixed, regardless of size; however, a 1ft by 1ft louver will have a lower free area percentage than an 8ft x 8ft louver, as the frame takes up a smaller total area of the opening.\u003C\u002Fp>\n\u003Ch3 dir=\"ltr\">\u003Cstrong>Model\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp dir=\"ltr\">Every louver model will have different blade shapes and spacing, varying the free area for a given size of louver. \u003C\u002Fp>\n\u003Cfigure class=\"image\">\u003Cimg src=\"https:\u002F\u002Fawv-cdn.nyc3.cdn.digitaloceanspaces.com\u002Fblog\u002F_transforms\u002F_blogPost\u002F7036\u002Funnamed.webp\" alt=\"Why Is Louver Free Area Important?\" \u002F>\u003C\u002Ffigure>\n\u003Ch2 dir=\"ltr\">Why Is Free Area Important?\u003C\u002Fh2>\n\u003Cp dir=\"ltr\">Free area has an impact on how your louver functions in the field. It is best to go for the greatest possible free area, while keeping the beginning point of water penetration below your system max. To be more precise, the free area of a louver is:\u003Cbr \u002F>\u003C\u002Fp>\n\u003Cul>\u003Cli dir=\"ltr\">\u003Cp dir=\"ltr\">The open space between a louvered area’s blades\u003C\u002Fp>\u003C\u002Fli>\u003Cli dir=\"ltr\">\u003Cp dir=\"ltr\">The open space between the head of a louver and its highest blade\u003C\u002Fp>\u003C\u002Fli>\u003Cli dir=\"ltr\">\u003Cp dir=\"ltr\">The open space between a louver's sill and its lowest edge\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\n\u003Ch3 dir=\"ltr\">\u003Cstrong>Water Flow and Penetration\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp dir=\"ltr\">Typically, louvers with a higher free area will have a lower point of water penetration. However, the louver type makes a difference. Louvers can be non-drainable or drainable. A drainable unit incorporates gutters in every blade to enable additional water to accumulate. The water flows into downspouts and then out the bottom of the louver, at the sill. Drainable louvers have higher beginning points of water penetration than a non drainable louver. This means that you can select a louver with a smaller free area. \u003C\u002Fp>\n\u003Cfigure class=\"image\">\u003Cimg src=\"https:\u002F\u002Fawv-cdn.nyc3.cdn.digitaloceanspaces.com\u002Fblog\u002F_transforms\u002F_blogPost\u002F7032\u002Fpasted-image-0-17.webp\" alt=\"How Free Area Impacts the Purpose of Louvers\" \u002F>\u003C\u002Ffigure>\n\u003Ch3 dir=\"ltr\">\u003Cstrong>Pressure and Velocity\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp dir=\"ltr\">A lower pressure drop is beneficial for good airflow, as air can easily pass through a louver with little resistance. As a louver reduces in size, the free area velocity will increase for a fixed airflow, meaning higher water penetration and higher pressure drop. \u003Cbr \u002F>\u003C\u002Fp>\n\u003Ch2 dir=\"ltr\">How Free Area Impacts the Purpose of Louvers\u003C\u002Fh2>\n\u003Cp dir=\"ltr\">The key is to understand where your louver will go and the purpose it is going to serve. If the louver will not be fully exposed to the elements, water penetration may not be the primary concern. Perhaps your louver can perform well with a smaller free area with a higher water penetration point. It is imperative to find the best possible balance for your specific project. \u003C\u002Fp>\n\u003Cp dir=\"ltr\">For help selecting the best louver for your projects, \u003Ca href=\"https:\u002F\u002Fawv.com\u002Fcontact\u002F\">contact us today\u003C\u002Fa>. We would love to answer all your questions so you can make an informed decision about the best way to optimize your HVAC or exhaust system.\u003C\u002Fp>\n\u003Cp>\u003Cbr \u002F>\u003C\u002Fp>",[35],{"__typename":36,"url":37},"blog_Asset","https:\u002F\u002Fawv-cdn.nyc3.cdn.digitaloceanspaces.com\u002Fblog\u002Funnamed.jpeg",[39],{"__typename":40,"id":41,"ctaBackgroundImage":42,"ctaButtonText":43,"ctaFormHandle":44,"ctaHeadline":45,"ctaIsFeaturedImageHidden":46,"ctaThankYouRedirectPath":47,"ctaFeaturedImage":48},"callToActions_Entry","5226",[],"Free Louver Guide","louverSelectionGuideInlineForm","FIND THE RIGHT LOUVER FOR YOUR APPLICATION",true,"\u002Fthank-you?source=louver_guide",[49],{"__typename":50,"ctaFeaturedImageOptimizedImages":51},"callToActions_Asset",{"src":52,"srcset":53,"srcWebp":54,"srcsetWebp":55,"maxSrcsetWidth":56,"placeholderImage":57,"placeholderBox":58,"placeholderSilhouette":59},"https:\u002F\u002Fawv-cdn.nyc3.cdn.digitaloceanspaces.com\u002Fcall-to-actions\u002F_transforms\u002F_200x186_crop_center-center_60_line\u002Fawv_solutionsbylouver_offer.png","https:\u002F\u002Fawv-cdn.nyc3.cdn.digitaloceanspaces.com\u002Fcall-to-actions\u002F_transforms\u002F_200x186_crop_center-center_60_line\u002Fawv_solutionsbylouver_offer.png 200w, https:\u002F\u002Fawv-cdn.nyc3.cdn.digitaloceanspaces.com\u002Fcall-to-actions\u002F_transforms\u002F_600x559_crop_center-center_60_line\u002Fawv_solutionsbylouver_offer.png 600w","https:\u002F\u002Fawv-cdn.nyc3.cdn.digitaloceanspaces.com\u002Fcall-to-actions\u002F_transforms\u002F_200x186_crop_center-center_60_line\u002Fawv_solutionsbylouver_offer.png.webp","https:\u002F\u002Fawv-cdn.nyc3.cdn.digitaloceanspaces.com\u002Fcall-to-actions\u002F_transforms\u002F_200x186_crop_center-center_60_line\u002Fawv_solutionsbylouver_offer.png.webp 200w, https:\u002F\u002Fawv-cdn.nyc3.cdn.digitaloceanspaces.com\u002Fcall-to-actions\u002F_transforms\u002F_600x559_crop_center-center_60_line\u002Fawv_solutionsbylouver_offer.png.webp 600w",600,"data:image\u002Fjpeg;base64,%2F9j%2F4AAQSkZJRgABAQIAOwA7AAD%2F2wBDABALDA4MChAODQ4SERATGCgaGBYWGDEjJR0oOjM9PDkzODdASFxOQERXRTc4UG1RV19iZ2hnPk1xeXBkeFxlZ2P%2F2wBDARESEhgVGC8aGi9jQjhCY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2P%2FwAARCAAOABADASIAAhEBAxEB%2F8QAFQABAQAAAAAAAAAAAAAAAAAABAX%2FxAAiEAABAwMEAwEAAAAAAAAAAAABAgMEABESBRMhMQYVcaH%2FxAAUAQEAAAAAAAAAAAAAAAAAAAAC%2F8QAFxEAAwEAAAAAAAAAAAAAAAAAAAERIf%2FaAAwDAQACEQMRAD8AkafPjbbSnYMVSSgZHZFxbgmi%2BS6UGVidFxVGd7wFgk%2FB0Kn6a7ZWCuUi%2FwCik%2B7cYivw205tOXFnOk%2FKLtwSamn%2F2Q%3D%3D","data:image\u002Fsvg+xml,%3Csvg%20xmlns=%27http:\u002F\u002Fwww.w3.org\u002F2000\u002Fsvg%27%20width=%27600%27%20height=%27559%27%20style=%27background:%23cdab99%27%20\u002F%3E","data:image\u002Fsvg+xml,%3Csvg%20xmlns=%27http:\u002F\u002Fwww.w3.org\u002F2000\u002Fsvg%27%20width=%271%27%20height=%271%27%20style=%27background:%23CCC%27%20\u002F%3E",[],[],[63],{"__typename":40,"id":41,"ctaBackgroundImage":64,"ctaButtonText":43,"ctaFormHandle":44,"ctaHeadline":45,"ctaIsFeaturedImageHidden":46,"ctaThankYouRedirectPath":47,"ctaFeaturedImage":65},[],[66],{"__typename":50,"ctaFeaturedImageOptimizedImages":67},{"__typename":68,"src":52,"srcset":53,"srcWebp":54,"srcsetWebp":55,"maxSrcsetWidth":56,"placeholderImage":57,"placeholderBox":58,"placeholderSilhouette":59},"ctaFeaturedImageOptimizedImages_OptimizedImages",{"metaJsonLdContainer":70,"metaLinkContainer":71,"metaScriptContainer":72,"metaTagContainer":73,"metaTitleContainer":74},"{\"mainEntityOfPage\":{\"@context\":\"https:\\\u002F\\\u002Fschema.org\",\"@type\":\"CreativeWork\",\"author\":{\"@id\":\"#identity\"},\"copyrightHolder\":{\"@id\":\"#identity\"},\"copyrightYear\":\"2021\",\"creator\":{\"@id\":\"#creator\"},\"dateCreated\":\"2021-09-24T13:16:56-04:00\",\"dateModified\":\"2021-10-04T12:32:14-04:00\",\"datePublished\":\"2021-06-17T13:16:00-04:00\",\"description\":\"Louver free area space: Finding the right balance between energy use and airflow is critical to building a sound HVAC or exhaust system. 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Learn more.\",\"name\":\"twitter:description\"},\"twitter:image\":{\"content\":\"https:\\\u002F\\\u002Fawv-cdn.nyc3.cdn.digitaloceanspaces.com\\\u002Fblog\\\u002F_transforms\\\u002F_800x418_crop_center-center_82_none\\\u002Funnamed.jpeg?mtime=1715093316\",\"name\":\"twitter:image\"},\"twitter:image:width\":{\"content\":\"800\",\"name\":\"twitter:image:width\"},\"twitter:image:height\":{\"content\":\"418\",\"name\":\"twitter:image:height\"},\"twitter:image:alt\":[],\"google-site-verification\":[],\"bing-site-verification\":[],\"pinterest-site-verification\":[]}","{\"title\":{\"title\":\"Louver Free Area Space: Finding the Right Balance\"}}",[76,115],{"headline":77,"byline":78,"shortDesc":79,"longDesc":80,"featuredImage":81,"featuredImageSticky":86,"featuredImageInline":90,"featuredImageFeatured":94,"featuredImageSidebar":98,"featuredImageModal":102,"start":106,"end":107,"link":108,"zone":111,"priority":113,"learnMoreText":114},"Louvers for Style and Aesthetics","Our 75-minute Self-paced Course on Louver Design","Learn the basics of louver design with this free online course. 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