Kea General Information Sizing Within Flex Duct Sizing Chart24391

Kea General Information Sizing Within Flex Duct Sizing Chart 24391 A rectangular 6×6 inch duct has an airflow of 110 cfm. bigger 6×12 inch ducts can handle 270 cfm airflow. the bigger the crosssection of ducts, the bigger cfm; that’s pretty obvious. the smallest 6×4 ducts can handle 60 cfm airflow. the biggest 42×12 ducts with 504 sq inch crosssection can handle 3000 cfm airflow. Now, multiply 3 x 400 cfm to get 1200. you would need a blower that can move 1200 cfm. pro tip: round up – if you’re more than halfway to the next larger size, round up to it. in our example, if you needed 33,500 btu, or 2.75 tons, round up to 3 tons and multiply by 400 cfm per ton for the same result – 1,200 cfm.

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