{"id":20594,"date":"2022-08-02T13:18:36","date_gmt":"2022-08-02T13:18:36","guid":{"rendered":"https:\/\/thetibble.com\/?p=20594"},"modified":"2023-08-03T21:52:48","modified_gmt":"2023-08-03T21:52:48","slug":"range-hood-duct-length-dimension-guide","status":"publish","type":"post","link":"https:\/\/thetibble.com\/range-hood-duct-length-dimension-guide\/","title":{"rendered":"Range Hood Duct Length and Dimension Guide (Tables &#038; Charts)"},"content":{"rendered":"<style>img#mv-trellis-img-1::before{padding-top:25%; }img#mv-trellis-img-1{display:block;}img#mv-trellis-img-2::before{padding-top:72.9%; }img#mv-trellis-img-2{display:block;}img#mv-trellis-img-3::before{padding-top:72.9%; }img#mv-trellis-img-3{display:block;}img#mv-trellis-img-4::before{padding-top:72.9%; }img#mv-trellis-img-4{display:block;}<\/style>\n<p>Range hood duct length and dimension are regulated by building codes. In the USA, the International Residential Code (IRC) is applied, although there are sometimes state-level local adaptations and additions to this code, which would take precedence should they differ from the IRC.<\/p>\n\n\n\n<p>This article focuses on what the IRC says regarding the length and dimensions of range hood ducts. At the end, we will provide you with a link to help you to find the individual state codes so that you can check for any changes that would be applicable in your area.<\/p>\n\n\n<div class=\"lazyblock-nutshell-1vauzI wp-block-lazyblock-nutshell\"><p class=\"has-text-align-left has-text-color has-background\" style=\"background-color:#e7d1b1;color:#575f60;font-size:18px\"><noscript><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"150\" class=\"wp-image-3497\" style=\"width: 200px;\" src=\"https:\/\/thetibble.com\/wp-content\/uploads\/2021\/08\/nutshell1-11.png\" alt=\"\" srcset=\"https:\/\/thetibble.com\/wp-content\/uploads\/2021\/08\/nutshell1-11.png 600w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/08\/nutshell1-11-300x75.png 300w\" sizes=\"(max-width: 600px) 100vw, 600px\"><\/noscript><img loading=\"eager\" decoding=\"async\" width=\"600\" height=\"150\" class=\"wp-image-3497 eager-load\" style=\"width: 200px;\" src=\"data:image\/svg+xml,%3Csvg%20xmlns='http:\/\/www.w3.org\/2000\/svg'%20viewBox='0%200%20600%20150'%3E%3Crect%20width='600'%20height='150'%20style='fill:%23e3e3e3'\/%3E%3C\/svg%3E\" alt=\"\" sizes=\"(max-width: 600px) 100vw, 600px\" data-pin-media=\"https:\/\/thetibble.com\/wp-content\/uploads\/2021\/08\/nutshell1-11.png\" id=\"mv-trellis-img-1\" data-src=\"https:\/\/thetibble.com\/wp-content\/uploads\/2021\/08\/nutshell1-11.png.webp\" data-srcset=\"https:\/\/thetibble.com\/wp-content\/uploads\/2021\/08\/nutshell1-11.png.webp 600w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/08\/nutshell1-11-300x75.png.webp 300w\" data-svg=\"1\" data-trellis-processed=\"1\"><br><strong>The maximum allowable range hood duct length depends on the capacity of the range hood (CFM), the diameter of the duct, and the number of elbows\/bends. Longer ducts and more elbows mean lower exhaust efficiency. Widening the ducts increases efficiency. Stronger fans need wider ducts and shorter runs. <\/strong> <\/p><\/div>\n\n\n<h2 class=\"wp-block-heading\">Where to Look in the IRC<\/h2>\n\n\n\n<p>The regulations specifically pertaining to range hood ventilation are found in <a rel=\"noreferrer noopener\" href=\"https:\/\/codes.iccsafe.org\/content\/IRC2021P1\/chapter-15-exhaust-systems#IRC2021P1_Pt05_Ch15_SecM1503\" target=\"_blank\">Section M1503<\/a> of the IRC. However, the dimensions and the length of range hood ductwork are found in <a rel=\"noreferrer noopener\" href=\"https:\/\/codes.iccsafe.org\/content\/IRC2021P1\/chapter-15-exhaust-systems#IRC2021P1_Pt05_Ch15_SecM1504\" target=\"_blank\">Section M1504<\/a>, which applies generally to exhaust ducts, including the range hoods.<\/p>\n\n\n\n<figure class=\"wp-block-pullquote\"><blockquote><p>These sections also cover things like <a href=\"https:\/\/thetibble.com\/range-hood-type-duct-use\/\">what type of ducting material can be used<\/a>. <\/p><\/blockquote><\/figure>\n\n\n\n<p>The ducts are how the air is exhausted to the outside and they are required to maintain healthy indoor air quality in a room that produces lots of heat, smells, steam, and cooking by-products.<\/p>\n\n\n\n<p>The dimensions of range hood ducting (length and diameter) as well as the rage hood capacity (measured in CFM) are all interconnected and all influence the way in which kitchen air is conveyed to the outside. <\/p>\n\n\n\n<p>First, let&rsquo;s get a general understanding, then we can look at how the systems are influenced by each of these factors.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How Range Hood Ducts Convey Air Outside<\/h2>\n\n\n\n<p>Range hoods provide active ventilation. This means that energy is added to a system in order to achieve the goal of ventilation. The range hood exhaust fan is the source of added energy.<\/p>\n\n\n\n<p>As the fan operates, it pulls air from the kitchen and into the ductwork at a certain rate (cubic feet of air per minute = CFM). When the air is inside the ducts, it exists at a greater pressure than it had in the kitchen because the size of the &ldquo;container&rdquo; decreased. <\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><noscript><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"729\" src=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Kitchen-with-stove-and-range-hood.jpg\" alt=\"Kitchen with stove and range hood\" class=\"wp-image-20831\" srcset=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Kitchen-with-stove-and-range-hood.jpg 1000w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Kitchen-with-stove-and-range-hood-300x219.jpg 300w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Kitchen-with-stove-and-range-hood-768x560.jpg 768w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Kitchen-with-stove-and-range-hood-735x536.jpg 735w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Kitchen-with-stove-and-range-hood-335x244.jpg 335w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Kitchen-with-stove-and-range-hood-347x253.jpg 347w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Kitchen-with-stove-and-range-hood-520x379.jpg 520w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Kitchen-with-stove-and-range-hood-640x467.jpg 640w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Kitchen-with-stove-and-range-hood-960x700.jpg 960w\" sizes=\"(max-width: 760px) calc(100vw - 24px), 720px\"><\/noscript><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"729\" src=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Kitchen-with-stove-and-range-hood.jpg.webp\" alt=\"Kitchen with stove and range hood\" class=\"wp-image-20831 lazyload\" srcset=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Kitchen-with-stove-and-range-hood.jpg.webp 1000w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Kitchen-with-stove-and-range-hood-300x219.jpg.webp 300w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Kitchen-with-stove-and-range-hood-768x560.jpg.webp 768w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Kitchen-with-stove-and-range-hood-735x536.jpg.webp 735w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Kitchen-with-stove-and-range-hood-335x244.jpg.webp 335w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Kitchen-with-stove-and-range-hood-347x253.jpg.webp 347w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Kitchen-with-stove-and-range-hood-520x379.jpg.webp 520w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Kitchen-with-stove-and-range-hood-640x467.jpg.webp 640w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Kitchen-with-stove-and-range-hood-960x700.jpg.webp 960w\" sizes=\"(max-width: 760px) calc(100vw - 24px), 720px\" data-pin-media=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Kitchen-with-stove-and-range-hood.jpg\" id=\"mv-trellis-img-2\" data-trellis-processed=\"1\"><\/figure>\n\n\n\n<p>The movement of the fan blades actively pushes the air through the ducts and is aided to a certain extent by passive movement of the air resulting from a pressure gradient between the air in the ducts and the air outside of the house.<\/p>\n\n\n\n<p>The pressure created in the duct will manifest in one of two ways. It will either become velocity pressure, which drives the forward momentum of the air through the ducts, or it will become static pressure, which opposes this movement. <\/p>\n\n\n\n<p>It&rsquo;s never going to be all one and none of the other, but the ratio of the two makes a difference. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Reducing Static Pressure<\/h2>\n\n\n\n<p>You may be more familiar with the alternative names for static pressure: friction or resistance. Some of the energy given to the movement of the air by the range hood fan is lost to static pressure as the air flows through the duct. <\/p>\n\n\n\n<p>Basically, in exhaust systems, the goal is to minimize static pressure in whatever ways possible. <\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Length and Static Pressure<\/h3>\n\n\n\n<p class=\"has-central-palette-1-background-color has-background\"><strong>Increased length of a range hood duct system means increased static pressure and decreased exhaust efficiency.<\/strong><\/p>\n\n\n\n<p>Technically, the <em>rate<\/em> of exhaustion, which is calculated at the fan (how much air is removed from the kitchen over a certain amount of time), is not affected by increasing the length of the duct.<\/p>\n\n\n\n<p>However, the <em>efficiency<\/em> of exhausting air from a kitchen can be seen as how well the air moves through the duct and reaches the outside, where it cannot exert its negative effects.<\/p>\n\n\n\n<p>The longer the ducts (assuming a constant diameter and CFM), the longer it takes for the air to exit the house because it has further to travel. <\/p>\n\n\n\n<p>In addition, the longer the air is in the duct, the greater the surface area on which static pressure can be exerted. This means that the air loses energy and slows down, taking still longer to exit the duct.<\/p>\n\n\n\n<p>The slower the air moves, the more likely it is to deposit contaminants (including moisture) inside the duct. <\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Diameter and Static Pressure<\/h3>\n\n\n\n<p><strong>A wider duct is always more efficient. The reason is that you reduce the percentage of air in contact with the walls of the duct, reducing static pressure.<\/strong><\/p>\n\n\n\n<p>Let&rsquo;s assume we have a range hood that operates at 80 CFM.<\/p>\n\n\n\n<p>If 80 cubic feet of air was drawn into a 3&Prime; duct in a single minute, then the 80 cubic feet of air would be spread over a longer stretch of the duct at any given moment.<\/p>\n\n\n\n<p>The same amount of air drawn into a 6&Prime; duct would have more vertical space to fill and would not extend so far into the duct and would, therefore, be in contact with less duct surface area. Less of the energy provided by the range hood motor will be needed to overcome resistance and the air will flow through the ducts more efficiently.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><noscript><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"729\" src=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/80-CFM-Range-Hood-with-6-inches-diameter-duct-vs-3-inches-diameter-duct.jpg\" alt=\"80 CFM Range Hood with 6 inches diameter duct vs 3 inches diameter duct\" class=\"wp-image-20833\" srcset=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/80-CFM-Range-Hood-with-6-inches-diameter-duct-vs-3-inches-diameter-duct.jpg 1000w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/80-CFM-Range-Hood-with-6-inches-diameter-duct-vs-3-inches-diameter-duct-300x219.jpg 300w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/80-CFM-Range-Hood-with-6-inches-diameter-duct-vs-3-inches-diameter-duct-768x560.jpg 768w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/80-CFM-Range-Hood-with-6-inches-diameter-duct-vs-3-inches-diameter-duct-735x536.jpg 735w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/80-CFM-Range-Hood-with-6-inches-diameter-duct-vs-3-inches-diameter-duct-335x244.jpg 335w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/80-CFM-Range-Hood-with-6-inches-diameter-duct-vs-3-inches-diameter-duct-347x253.jpg 347w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/80-CFM-Range-Hood-with-6-inches-diameter-duct-vs-3-inches-diameter-duct-520x379.jpg 520w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/80-CFM-Range-Hood-with-6-inches-diameter-duct-vs-3-inches-diameter-duct-640x467.jpg 640w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/80-CFM-Range-Hood-with-6-inches-diameter-duct-vs-3-inches-diameter-duct-960x700.jpg 960w\" sizes=\"(max-width: 760px) calc(100vw - 24px), 720px\"><\/noscript><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"729\" src=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/80-CFM-Range-Hood-with-6-inches-diameter-duct-vs-3-inches-diameter-duct.jpg.webp\" alt=\"80 CFM Range Hood with 6 inches diameter duct vs 3 inches diameter duct\" class=\"wp-image-20833 lazyload\" srcset=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/80-CFM-Range-Hood-with-6-inches-diameter-duct-vs-3-inches-diameter-duct.jpg.webp 1000w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/80-CFM-Range-Hood-with-6-inches-diameter-duct-vs-3-inches-diameter-duct-300x219.jpg.webp 300w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/80-CFM-Range-Hood-with-6-inches-diameter-duct-vs-3-inches-diameter-duct-768x560.jpg.webp 768w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/80-CFM-Range-Hood-with-6-inches-diameter-duct-vs-3-inches-diameter-duct-735x536.jpg.webp 735w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/80-CFM-Range-Hood-with-6-inches-diameter-duct-vs-3-inches-diameter-duct-335x244.jpg.webp 335w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/80-CFM-Range-Hood-with-6-inches-diameter-duct-vs-3-inches-diameter-duct-347x253.jpg.webp 347w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/80-CFM-Range-Hood-with-6-inches-diameter-duct-vs-3-inches-diameter-duct-520x379.jpg.webp 520w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/80-CFM-Range-Hood-with-6-inches-diameter-duct-vs-3-inches-diameter-duct-640x467.jpg.webp 640w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/80-CFM-Range-Hood-with-6-inches-diameter-duct-vs-3-inches-diameter-duct-960x700.jpg.webp 960w\" sizes=\"(max-width: 760px) calc(100vw - 24px), 720px\" data-pin-media=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/80-CFM-Range-Hood-with-6-inches-diameter-duct-vs-3-inches-diameter-duct.jpg\" id=\"mv-trellis-img-3\" data-trellis-processed=\"1\"><\/figure>\n\n\n\n<p><strong>The reason why we don&rsquo;t all just install really wide ducts is, quite simply, that they take up too much space and are composed of more materials, making them more costly. <\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Duct Dimensions and Range Hood Strength<\/h2>\n\n\n\n<p>As with everything in ventilation, however, it&rsquo;s not just that simple. In our example, the fan was 80 CFM in both cases. If it were 40 CFM for the 3&Prime; duct and 80 CFM for the 6&Prime; duct, then you are looking at very comparable systems in terms of efficiency because the ratio of static to velocity pressure is the same. <\/p>\n\n\n\n<p>So, the size of the fan will also influence ideal duct diameter. <\/p>\n\n\n\n<p class=\"has-central-palette-1-background-color has-background\">For interest&rsquo;s sake, neither a 40 CFM nor an 80 CFM fan is good enough for a range hood. According to IRC <a href=\"https:\/\/codes.iccsafe.org\/content\/IRC2021P1\/chapter-15-exhaust-systems#IRC2021P1_Pt05_Ch15_SecM1505.4.4\" target=\"_blank\" rel=\"noreferrer noopener\">Section M1505.4.4<\/a>, your kitchen has to have an exhaust rate of 100 CFM (unless it operates continuously, in which case it can be 25 CFM). However, 40 and 80 CFM are good enough for our examples. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Range Hood Exhaust System Table of Dimensions<\/h2>\n\n\n\n<p>There is no perfect duct length or diameter for all systems, but there are guidelines on how maximum allowable length is affected by fan strength, duct diameter, and the number of elbows\/bends in the system. <\/p>\n\n\n\n<p>All of this information can be found in the IRC, specifically <a rel=\"noreferrer noopener\" href=\"https:\/\/codes.iccsafe.org\/content\/IRC2021P1\/chapter-15-exhaust-systems#IRC2021P1_Pt05_Ch15_SecM1504.2\" target=\"_blank\">Table M1504.2<\/a>. However, you should note that the information in the table is for all exhaust systems and not all the data are applicable to range hood exhaust ducts. <\/p>\n\n\n\n<p>The table below is based on the table in the IRC, but it is adapted for range hoods specifically. <\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><noscript><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"729\" src=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Table-M1504.2-Duct-Length.jpg\" alt=\"Table M1504.2 Duct Length, Range hood duct length and dimensions table\" class=\"wp-image-20834\" srcset=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Table-M1504.2-Duct-Length.jpg 1000w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Table-M1504.2-Duct-Length-300x219.jpg 300w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Table-M1504.2-Duct-Length-768x560.jpg 768w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Table-M1504.2-Duct-Length-735x536.jpg 735w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Table-M1504.2-Duct-Length-335x244.jpg 335w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Table-M1504.2-Duct-Length-347x253.jpg 347w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Table-M1504.2-Duct-Length-520x379.jpg 520w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Table-M1504.2-Duct-Length-640x467.jpg 640w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Table-M1504.2-Duct-Length-960x700.jpg 960w\" sizes=\"(max-width: 760px) calc(100vw - 24px), 720px\"><\/noscript><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"729\" src=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Table-M1504.2-Duct-Length.jpg.webp\" alt=\"Table M1504.2 Duct Length, Range hood duct length and dimensions table\" class=\"wp-image-20834 lazyload\" srcset=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Table-M1504.2-Duct-Length.jpg.webp 1000w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Table-M1504.2-Duct-Length-300x219.jpg.webp 300w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Table-M1504.2-Duct-Length-768x560.jpg.webp 768w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Table-M1504.2-Duct-Length-735x536.jpg.webp 735w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Table-M1504.2-Duct-Length-335x244.jpg.webp 335w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Table-M1504.2-Duct-Length-347x253.jpg.webp 347w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Table-M1504.2-Duct-Length-520x379.jpg.webp 520w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Table-M1504.2-Duct-Length-640x467.jpg.webp 640w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Table-M1504.2-Duct-Length-960x700.jpg.webp 960w\" sizes=\"(max-width: 760px) calc(100vw - 24px), 720px\" data-pin-media=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/08\/Table-M1504.2-Duct-Length.jpg\" id=\"mv-trellis-img-4\" data-trellis-processed=\"1\"><\/figure>\n\n\n\n<p>The following adaptations have been made: <\/p>\n\n\n\n<ul><li>Flexible duct dimensions have been omitted because range hoods are not permitted to have flexible ductwork.<\/li><li>Fan ratings less than 100 CFM have been omitted because range hoods must have an intermittent exhaust rating of at least 100 CFM. <\/li><li>The 3&Prime; duct diameter was omitted because there is no allowable ducting length for this diameter with fans over 100 CFM.<\/li><\/ul>\n\n\n\n<p>Looking at the rows in the above table, we can see that maximum allowable ducting length decreases as the fans get more powerful. At first this does not make sense. <\/p>\n\n\n\n<p>However, if you look at the column in the table, you will see that the maximum allowable length of ducting for a range hood with a certain capacity increases with increasing duct diameter.<\/p>\n\n\n\n<p>What this tells us is that the issue with big range hoods and long ducts is static pressure. The more air you are trying to force into a smaller space, the more static pressure is produced. This equates to energy losses and reduced airflow, which means the longer the air travels, the less likely it is to actually exit the duct.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Elbows\/Bends<\/h3>\n\n\n\n<p>Be aware that these lengths represent what is allowable for completely straight duct runs. If you need to add bends or elbows, you will subtract 15 ft per bend or elbow from the allowable length. <\/p>\n\n\n\n<p class=\"has-text-align-center\">\n    <a data-amazonimages=\"\" target=\"_blank\" title=\"6 Inch 90-Degree HVAC Elbow Duct - Galvanized 26 Gauge Adjustable Sheet Metal Elbow Duct Connector, Flexible Round Tube Air Ventilation &amp; Fully Adjustable Vent Pipe HVAC Ductwork - Easy to Install\" href=\"https:\/\/www.amazon.com\/dp\/B00BLUA5Z8?tag=hvacbuzz-20\" rel=\"nofollow noopener\"><noscript><img decoding=\"async\" class=\"size-large aligncenter\" src=\"https:\/\/m.media-amazon.com\/images\/I\/31CwjkikEgL._SL500_.jpg\" alt=\"6 Inch 90-Degree HVAC Elbow Duct - Galvanized 26 Gauge Adjustable Sheet Metal Elbow Duct Connector, Flexible Round Tube Air Ventilation &amp; Fully Adjustable Vent Pipe HVAC Ductwork - Easy to Install\" title=\"6 Inch 90-Degree HVAC Elbow Duct - Galvanized 26 Gauge Adjustable Sheet Metal Elbow Duct Connector, Flexible Round Tube Air Ventilation &amp; Fully Adjustable Vent Pipe HVAC Ductwork - Easy to Install\"><\/noscript><img decoding=\"async\" class=\"size-large aligncenter lazyload\" src=\"https:\/\/m.media-amazon.com\/images\/I\/31CwjkikEgL._SL500_.jpg\" alt=\"6 Inch 90-Degree HVAC Elbow Duct - Galvanized 26 Gauge Adjustable Sheet Metal Elbow Duct Connector, Flexible Round Tube Air Ventilation &amp; Fully Adjustable Vent Pipe HVAC Ductwork - Easy to Install\" title=\"6 Inch 90-Degree HVAC Elbow Duct - Galvanized 26 Gauge Adjustable Sheet Metal Elbow Duct Connector, Flexible Round Tube Air Ventilation &amp; Fully Adjustable Vent Pipe HVAC Ductwork - Easy to Install\" data-mvt-skip=\"src\" loading=\"lazy\" data-trellis-processed=\"1\"><\/a>\n<\/p>\n\n\n\n<p>This means:<\/p>\n\n\n\n<ul><li>If you cannot exhaust a range hood straight out of the kitchen wall or roof, then you cannot use a 4&Prime; duct. <\/li><li>5&Prime; ducts are only allowed if your fan is between 100 and 200 CFM.<\/li><li>If you add an elbow, you cannot use a 5&Prime; duct for a 200 CFM range hood.<\/li><li>If you add an elbow, you cannot use a 6&Prime; duct for a 300 CFM range hood.<\/li><li>You can only have a maximum of 1 elbow with a 150 CFM range hood and a 5&Prime; duct.<\/li><li>You can only have a maximum of 1 elbow with a 250 CFM range hood and a 6&Prime; duct.<\/li><\/ul>\n\n\n\n<p>There are other rules surrounding range hood ducts, which you can find in my article explaining the <a href=\"https:\/\/thetibble.com\/range-hood-vent-code-requirements\/\">range hood code into easy-to-understand English<\/a>. And if you are finding all the rules a bit daunting, then why not read about all the <a href=\"https:\/\/thetibble.com\/is-a-range-hood-necessary\/\" data-type=\"post\" data-id=\"1100\">great benefits of exhaust hood<\/a>. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Sources<\/h2>\n\n\n\n<p><a href=\"https:\/\/www.energyvanguard.com\/blog\/the-2-primary-causes-of-reduced-air-flow-in-ducts\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.energyvanguard.com\/blog\/the-2-primary-causes-of-reduced-air-flow-in-ducts\/<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.energyvanguard.com\/blog\/basic-principles-duct-design\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.energyvanguard.com\/blog\/basic-principles-duct-design\/<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.achrnews.com\/articles\/102825-basics-of-airflow\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.achrnews.com\/articles\/102825-basics-of-airflow<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.aireserv.com\/about\/blog\/2020\/april\/sizing-ductwork-is-my-ductwork-size-too-narrow-\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.aireserv.com\/about\/blog\/2020\/april\/sizing-ductwork-is-my-ductwork-size-too-narrow-\/<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.nrel.gov\/docs\/fy03osti\/29166.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.nrel.gov\/docs\/fy03osti\/29166.pdf<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/homes.lbl.gov\/ventilate-right\/step-6-duct-design\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/homes.lbl.gov\/ventilate-right\/step-6-duct-design<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.engineeringtoolbox.com\/equivalent-diameter-d_443.html\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.engineeringtoolbox.com\/equivalent-diameter-d_443.html<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Range hood duct length and dimension are regulated by building codes. In the USA, the International Residential Code (IRC) is applied, although there are sometimes state-level local adaptations and additions &hellip;<\/p>\n","protected":false},"author":59,"featured_media":20830,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_themeisle_gutenberg_block_has_review":false,"footnotes":"","disable-in-feed":false,"article-schema-type":"","disable-critical-css":false},"categories":[296,13,300],"tags":[119,210,82],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Range Hood Duct Length and Dimension Guide (Tables &amp; Charts) - The Tibble<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/thetibble.com\/range-hood-duct-length-dimension-guide\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Range Hood Duct Length and Dimension Guide (Tables &amp; Charts) - The Tibble\" \/>\n<meta property=\"og:description\" content=\"Range hood duct length and dimension are regulated by building codes. 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