{"id":14900,"date":"2022-05-04T11:51:21","date_gmt":"2022-05-04T11:51:21","guid":{"rendered":"https:\/\/thetibble.com\/?p=14900"},"modified":"2023-12-19T10:03:02","modified_gmt":"2023-12-19T10:03:02","slug":"4-or-6-duct-bathroom-fan","status":"publish","type":"post","link":"https:\/\/thetibble.com\/4-or-6-duct-bathroom-fan\/","title":{"rendered":"4\u201d or 6\u201d Duct for Bathroom Fan"},"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:55.46875%; }img#mv-trellis-img-4{display:block;}img#mv-trellis-img-5::before{padding-top:55.37109375%; }img#mv-trellis-img-5{display:block;}<\/style>\n<p>The main purpose of a bathroom fan duct is to conduct exhausted air from your bathroom to the outside. It is, therefore, important that the duct is correctly sized to create an optimal flow of air out the external vent. <\/p>\n\n\n\n<p>Most bathroom fans use a  4&Prime; or 6&Prime; duct for installation. Read on to see what size is best suited for your bathroom needs. <\/p>\n\n\n<div class=\"lazyblock-nutshell-Z2gsb9s 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=\"200\" height=\"50\" 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: 200px) 100vw, 200px\"><\/noscript><img loading=\"eager\" decoding=\"async\" width=\"200\" height=\"50\" 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%20200%2050'%3E%3Crect%20width='200'%20height='50'%20style='fill:%23e3e3e3'\/%3E%3C\/svg%3E\" alt=\"\" sizes=\"(max-width: 200px) 100vw, 200px\" 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>4\" and 6\" ducts are both common sizes. Which size is best depends on the fan&rsquo;s capacity rating, the duct material, and the length of the ductwork. For the most part, the connection point that the fan comes with is the best to use. Adapters should be avoided.<\/strong> <\/p><\/div>\n\n\n<h2 class=\"wp-block-heading\">What Size is the Connection Point?<\/h2>\n\n\n\n<p>Most bathroom fans are made with either a 4&Prime; or a 6&Prime; connection point, which makes finding the right duct much easier as you would just need to choose the appropriate duct for your connection point. <\/p>\n\n\n\n<p>You do get adaptors that allow you to fit a 6&Prime; duct to a 4&Prime; connection point and vice versa, but it is best to use the duct that will fit correctly on the connection point; otherwise, it impacts your airflow. <\/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\/05\/ventilation-in-the-ceiling.jpg\" alt=\"ventilation in the ceiling\" class=\"wp-image-15652\" srcset=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/ventilation-in-the-ceiling.jpg 1000w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/ventilation-in-the-ceiling-300x219.jpg 300w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/ventilation-in-the-ceiling-768x560.jpg 768w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/ventilation-in-the-ceiling-735x536.jpg 735w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/ventilation-in-the-ceiling-335x244.jpg 335w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/ventilation-in-the-ceiling-347x253.jpg 347w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/ventilation-in-the-ceiling-520x379.jpg 520w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/ventilation-in-the-ceiling-640x467.jpg 640w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/ventilation-in-the-ceiling-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\/05\/ventilation-in-the-ceiling.jpg.webp\" alt=\"ventilation in the ceiling\" class=\"wp-image-15652 lazyload\" srcset=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/ventilation-in-the-ceiling.jpg.webp 1000w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/ventilation-in-the-ceiling-300x219.jpg.webp 300w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/ventilation-in-the-ceiling-768x560.jpg.webp 768w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/ventilation-in-the-ceiling-735x536.jpg.webp 735w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/ventilation-in-the-ceiling-335x244.jpg.webp 335w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/ventilation-in-the-ceiling-347x253.jpg.webp 347w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/ventilation-in-the-ceiling-520x379.jpg.webp 520w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/ventilation-in-the-ceiling-640x467.jpg.webp 640w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/ventilation-in-the-ceiling-960x700.jpg.webp 960w\" sizes=\"(max-width: 760px) calc(100vw - 24px), 720px\" data-pin-media=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/ventilation-in-the-ceiling.jpg\" id=\"mv-trellis-img-2\" data-trellis-processed=\"1\"><\/figure>\n\n\n\n<p>The fan capacity and the duct size are critically interconnected and manufacturers will use a connection point that fits the duct that will be the best for use with the fan and the amount of air it pulls into the duct at a time. <\/p>\n\n\n\n<p>If you use a duct that is larger than recommended, then the airflow is negatively affected. If the fan pulls a certain volume of air into a duct that is too wide, the air would lose momentum. It would have a larger volume to fill, and so the pressure would decrease. <\/p>\n\n\n\n<p>True, there would be less friction, but the concurrent loss of velocity pressure means the air will not move towards the terminal vent effectively (this is only true if the fan is underpowered).<\/p>\n\n\n\n<p>If the <a href=\"https:\/\/thetibble.com\/reducing-duct-size-6-to-4-inch-drawbacks\/\">duct was too narrow<\/a> the friction or static pressure would be too great for the velocity pressure to overcome and the air also would not move through the ducts effectively. Using a narrower duct can also create a lot of noise. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Duct Size Depends on Bathroom Size and Fan Capacity<\/h2>\n\n\n\n<p>Some fans come with a single connection point but with the option to cut it in a way that turns the 4&Prime; connection into a 6&Prime; connection. So, what do you do in these cases?<\/p>\n\n\n\n<p>In order to choose the correct duct size, you need to determine the correct <a rel=\"noreferrer noopener\" href=\"https:\/\/thetibble.com\/bathroom-fan-cfm-calculator\/\" target=\"_blank\">Bathroom Fan Capacity (CFM)<\/a>. This involves using the size of your bathroom to help determine the fan capacity you need. From there, you will be able to find the appropriate diameter range for your duct.  I have added a table below for your convenience. <\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>Bathroom Fan Capacity (CFM)<\/td><td>Appropriate Diameter Range<\/td><td>Recommended Diameter*<\/td><\/tr><tr><td>50<\/td><td>3&rdquo; to 4&rdquo;<\/td><td>4&rdquo;<\/td><\/tr><tr><td>80<\/td><td>4&rdquo; to 5&rdquo;<\/td><td>4&rdquo;<\/td><\/tr><tr><td>100<\/td><td>4&rdquo; to 6&rdquo;<\/td><td>6&rdquo;<\/td><\/tr><tr><td>125<\/td><td>5&rdquo; to 6&rdquo;<\/td><td>6&rdquo;<\/td><\/tr><tr><td>150<\/td><td>6&rdquo; to 7&rdquo;<\/td><td>7&rdquo;<\/td><\/tr><tr><td>200<\/td><td>7&rdquo; to 8&rdquo;<\/td><td>7&rdquo;<\/td><\/tr><tr><td>250<\/td><td>7&rdquo; to 8&rdquo;<\/td><td>8&rdquo;<\/td><\/tr><tr><td>300<\/td><td>8&rdquo; to 9&rdquo;<\/td><td>8&rdquo;<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">*Although these are the diameters we recommend, the manufacturer&rsquo;s recommendations should always be followed as a first choice. If they do not specify the correct duct diameter, you can refer to the table<\/figcaption><\/figure>\n\n\n\n<p>The fan capacity will help determine the correct duct diameter to allow for efficient pressure to be released. Ducts that are 4&rdquo; to 6&rdquo; are suitable for most common bathroom fan capacity requirements and many fans will come with adapters for both diameter ranges, however, it is always important to look at your manufacturer&rsquo;s instructions before installation. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Required Duct Length Affects Duct Diameter<\/h2>\n\n\n\n<p>If you need the fan to vent a certain distance, then you need to pick the <a href=\"https:\/\/thetibble.com\/bath-fan-duct-length-dimension-table\/\" data-type=\"post\" data-id=\"2456\">duct size that will allow this length with the fan&rsquo;s rating<\/a>.<\/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\/05\/Bathroom-ventilation-fan-in-modern-interior-design-apartment-.jpg\" alt=\"Bathroom ventilation fan in modern interior design apartment \" class=\"wp-image-15650\" srcset=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/Bathroom-ventilation-fan-in-modern-interior-design-apartment-.jpg 1000w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/Bathroom-ventilation-fan-in-modern-interior-design-apartment--300x219.jpg 300w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/Bathroom-ventilation-fan-in-modern-interior-design-apartment--768x560.jpg 768w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/Bathroom-ventilation-fan-in-modern-interior-design-apartment--735x536.jpg 735w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/Bathroom-ventilation-fan-in-modern-interior-design-apartment--335x244.jpg 335w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/Bathroom-ventilation-fan-in-modern-interior-design-apartment--347x253.jpg 347w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/Bathroom-ventilation-fan-in-modern-interior-design-apartment--520x379.jpg 520w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/Bathroom-ventilation-fan-in-modern-interior-design-apartment--640x467.jpg 640w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/Bathroom-ventilation-fan-in-modern-interior-design-apartment--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\/05\/Bathroom-ventilation-fan-in-modern-interior-design-apartment-.jpg.webp\" alt=\"Bathroom ventilation fan in modern interior design apartment \" class=\"wp-image-15650 lazyload\" srcset=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/Bathroom-ventilation-fan-in-modern-interior-design-apartment-.jpg.webp 1000w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/Bathroom-ventilation-fan-in-modern-interior-design-apartment--300x219.jpg.webp 300w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/Bathroom-ventilation-fan-in-modern-interior-design-apartment--768x560.jpg.webp 768w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/Bathroom-ventilation-fan-in-modern-interior-design-apartment--735x536.jpg.webp 735w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/Bathroom-ventilation-fan-in-modern-interior-design-apartment--335x244.jpg.webp 335w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/Bathroom-ventilation-fan-in-modern-interior-design-apartment--347x253.jpg.webp 347w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/Bathroom-ventilation-fan-in-modern-interior-design-apartment--520x379.jpg.webp 520w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/Bathroom-ventilation-fan-in-modern-interior-design-apartment--640x467.jpg.webp 640w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/Bathroom-ventilation-fan-in-modern-interior-design-apartment--960x700.jpg.webp 960w\" sizes=\"(max-width: 760px) calc(100vw - 24px), 720px\" data-pin-media=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/05\/Bathroom-ventilation-fan-in-modern-interior-design-apartment-.jpg\" id=\"mv-trellis-img-3\" data-trellis-processed=\"1\"><\/figure>\n\n\n\n<p>The tables below is adapted from&nbsp;<a rel=\"noreferrer noopener\" href=\"https:\/\/codes.iccsafe.org\/content\/IRC2018\/chapter-15-exhaust-systems\" target=\"_blank\">Table M1504.2<\/a> of IRC, which specifies what duct diameter is needed in relation to the maximum ducting length required.<\/p>\n\n\n\n<p>It is important to note that the type of ducting you use will impact the length of ducting allowed. There are definite advantages and disadvantages to the different types of bathroom fan ducting, so you will need to keep this in mind when deciding on <a href=\"https:\/\/thetibble.com\/what-kind-duct-bath-fan\/\">what kind of duct to use<\/a>.<\/p>\n\n\n\n<p>It is also important to note that you will need to remove 15 feet from the allowable duct length for each <a href=\"https:\/\/thetibble.com\/can-bathroom-vent-duct-have-elbow\/\" data-type=\"post\" data-id=\"11327\">elbow added<\/a>. The IRC does not specifically limit the number of elbows you can use and as such, it is important to consult your local guidelines before installation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">&nbsp;Rigid Duct Length Sizing Table<\/h3>\n\n\n\n<figure class=\"wp-block-image\"><noscript><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"568\" src=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Rigid-bathroom-fan-sizing-charttable.jpg.webp\" alt=\"Rigid bathroom fan duct sizing chart\/table\" class=\"wp-image-14158\" srcset=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Rigid-bathroom-fan-sizing-charttable.jpg 1024w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Rigid-bathroom-fan-sizing-charttable-300x166.jpg 300w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Rigid-bathroom-fan-sizing-charttable-768x426.jpg 768w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Rigid-bathroom-fan-sizing-charttable-735x408.jpg 735w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Rigid-bathroom-fan-sizing-charttable-335x186.jpg 335w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Rigid-bathroom-fan-sizing-charttable-347x192.jpg 347w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Rigid-bathroom-fan-sizing-charttable-520x288.jpg 520w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Rigid-bathroom-fan-sizing-charttable-640x355.jpg 640w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Rigid-bathroom-fan-sizing-charttable-960x533.jpg 960w\" sizes=\"(max-width: 760px) calc(100vw - 24px), 720px\"><\/noscript><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"568\" src=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Rigid-bathroom-fan-sizing-charttable.jpg.webp\" alt=\"Rigid bathroom fan duct sizing chart\/table\" class=\"wp-image-14158 lazyload\" srcset=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Rigid-bathroom-fan-sizing-charttable.jpg 1024w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Rigid-bathroom-fan-sizing-charttable-300x166.jpg 300w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Rigid-bathroom-fan-sizing-charttable-768x426.jpg 768w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Rigid-bathroom-fan-sizing-charttable-735x408.jpg 735w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Rigid-bathroom-fan-sizing-charttable-335x186.jpg 335w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Rigid-bathroom-fan-sizing-charttable-347x192.jpg 347w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Rigid-bathroom-fan-sizing-charttable-520x288.jpg 520w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Rigid-bathroom-fan-sizing-charttable-640x355.jpg 640w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Rigid-bathroom-fan-sizing-charttable-960x533.jpg 960w\" sizes=\"(max-width: 760px) calc(100vw - 24px), 720px\" data-pin-media=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Rigid-bathroom-fan-sizing-charttable.jpg\" data-mvt-skip=\"src\" id=\"mv-trellis-img-4\" data-trellis-processed=\"1\"><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Flexible Duct Length Sizing Table<\/h3>\n\n\n\n<figure class=\"wp-block-image\"><noscript><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"567\" src=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Flexible-bathroom-fan-sizing-charttable.jpg.webp\" alt=\"Flexible bathroom fan duct sizing chart\/table\" class=\"wp-image-14159\" srcset=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Flexible-bathroom-fan-sizing-charttable.jpg 1024w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Flexible-bathroom-fan-sizing-charttable-300x166.jpg 300w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Flexible-bathroom-fan-sizing-charttable-768x425.jpg 768w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Flexible-bathroom-fan-sizing-charttable-735x407.jpg 735w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Flexible-bathroom-fan-sizing-charttable-335x185.jpg 335w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Flexible-bathroom-fan-sizing-charttable-347x192.jpg 347w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Flexible-bathroom-fan-sizing-charttable-520x288.jpg 520w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Flexible-bathroom-fan-sizing-charttable-640x354.jpg 640w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Flexible-bathroom-fan-sizing-charttable-960x532.jpg 960w\" sizes=\"(max-width: 760px) calc(100vw - 24px), 720px\"><\/noscript><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"567\" src=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Flexible-bathroom-fan-sizing-charttable.jpg.webp\" alt=\"Flexible bathroom fan duct sizing chart\/table\" class=\"wp-image-14159 lazyload\" srcset=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Flexible-bathroom-fan-sizing-charttable.jpg 1024w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Flexible-bathroom-fan-sizing-charttable-300x166.jpg 300w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Flexible-bathroom-fan-sizing-charttable-768x425.jpg 768w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Flexible-bathroom-fan-sizing-charttable-735x407.jpg 735w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Flexible-bathroom-fan-sizing-charttable-335x185.jpg 335w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Flexible-bathroom-fan-sizing-charttable-347x192.jpg 347w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Flexible-bathroom-fan-sizing-charttable-520x288.jpg 520w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Flexible-bathroom-fan-sizing-charttable-640x354.jpg 640w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Flexible-bathroom-fan-sizing-charttable-960x532.jpg 960w\" sizes=\"(max-width: 760px) calc(100vw - 24px), 720px\" data-pin-media=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/04\/Flexible-bathroom-fan-sizing-charttable.jpg\" data-mvt-skip=\"src\" id=\"mv-trellis-img-5\" data-trellis-processed=\"1\"><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Sources<\/h2>\n\n\n\n<p><a href=\"https:\/\/codes.iccsafe.org\/content\/IRC2018\/chapter-15-exhaust-systems\">https:\/\/codes.iccsafe.org\/content\/IRC2018\/chapter-15-exhaust-systems<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The main purpose of a bathroom fan duct is to conduct exhausted air from your bathroom to the outside. It is, therefore, important that the duct is correctly sized to &hellip;<\/p>\n","protected":false},"author":59,"featured_media":15649,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_themeisle_gutenberg_block_has_review":false,"disable-in-feed":false,"article-schema-type":"","disable-critical-css":false,"footnotes":""},"categories":[16,8,300],"tags":[46,20,73,90,89],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>4\u201d or 6\u201d Duct for Bathroom Fan - 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\/4-or-6-duct-bathroom-fan\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"4\u201d or 6\u201d Duct for Bathroom Fan - The Tibble\" \/>\n<meta property=\"og:description\" content=\"The main purpose of a bathroom fan duct is to conduct exhausted air from your bathroom to the outside. 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