Flex Duct Cfm Calculator

Cfm 4 cfm 6 cfm 8 cfm 10 cfm 12 60 6x4 60 4x6 90 4x8 120 4x10 150 4x12.

Flex duct cfm calculator.

Select the duct type on the pull down menu. Input the required cfm in the box below that. Friction loss calculator for sheet metal ducts. Enter duct airflow cfm duct velocity fpm duct length and the number of bends.

Cfm is flow rate in flex duct cubic feet per minute. Read round duct diameter inches and friction loss per 100 of duct inches of water. This online air duct calculator is used to calculate the velocity of air flow feet per minute fpm and feet per second fps through any shaped circle square or rectangle ductulator with either diameter sides or area. Flex duct 05 on most metal duct calculator round metal pipe 06 on most metal duct calculators field duct sizing chart rectangular sheet metal duct 07 on most metal duct calculators.

Calculations are for 60 f dry air at sea level from 5 to 3000 cfm approximately standard air which is 0 075lb da ft. Fpm is velocity in flex duct feet per minute. Air duct also termed as ductulator is a passage that is used to provide fresh air into rooms buildings etc air ducts may be in circular square and in rectangular shapes. Friction rate velocity friction rate.

Other hart cooley mobile tools. Sheet metal duct friction loss calculator. Metal ductboard flex size by. Duct cross sectional area air flow rate and air speed are used in calculating the duct size.

Read friction loss inches of water and duct velocity fpm. Enter the desired length of the rectangular duct. Rectangular duct is rounded up to the nearest 1 4 inch. Equivalent diameter is the diameter of a circular duct with similar pressure loss as an equivalent rectangular duct.

Enter round duct diameter inches duct airflow cfm duct length and the number of bends. Use the online duct calculator see references and calculate the needed flex duct size. Include fittings in the duct tel enter either. In wg duct tel.

Enter air flow and its velocity in air duct sizing calculator to find the diameter of duct size. Enter round duct diameter. Data is based on straight runs of quietflex non metallic flexible air ducts as tested in accordance with the air diffusion council fd 72r1 test code and in accordance with ashrae 120 1999 method of testing to determine flow resistance of hvac. Based on duct diameter.

Friction loss calculator for flexible ducts. Equivalent duct calculator round vs rectangular. Click calculate and you will see the size of flex duct you need for that room.