Flex Duct Cfm Chart

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 duct size duct height net inside dimension in inches round duct size estimate rectangular duct size estimate 14 5 6 7 8 16 18 20 design airflow 50 75 110 9 10 12 1300 1700 160 225 300 480 700 1000 duct size 5 6 7 8 18 20 9 10 12 flexible duct round metal pipe 750 1200 14 16. Read friction loss inches of water and duct velocity fpm. The flex duct size may be different than the hard duct that runs to that room.

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Flex Duct Sizing Chart Lovely Duct Size Vs Airflow Part 1

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Flex duct has a higher pressure drop and as such may require the size shown on this guide be increased by 1 round size for up to 800 cfm and 2 round sizes above 800 cfm to insure proper airflow.

Flex duct cfm chart. Calculations are for 60 f dry air at sea level from 5 to 3000 cfm approximately standard air which is 0 075lb da ft. Click calculate and you will see the size of flex duct you need for that room. Enter round duct diameter.

Read duct diameter inches and duct velocity fpm. Select the duct type on the pull down menu. Input the required cfm in the box below that.

The chart is based on metal duct. Larger volumes or higher static pressures should be dealt with on an individual job basis. Based on duct diameter.

Metal ductboard flex size by. Duct system sizes and airflow quick chart created date. In wg duct tel.

This equal friction method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications. If ashrae 2013 is selected flexible roughness is 0 003 ft when straight and fully stretched tight at 0 compression adjusted at other compressions otherwise the. Friction rate velocity friction rate.

Use the online duct calculator see references and calculate the needed flex duct size. Enter friction loss per 100 of duct inches of water duct airflow cfm duct length and the number of bends. For instance a 2 5 ton system approximately 400 cfm per ton would require 2 14 flexible return ducts or 1 very short flexible 18 duct to move the 1000 cfm required by the 2 5 ton system.

Air volume equivalent round air volume cfm 4 6 8 10 12 duct inches cfm 50 6 x 4 550 75 6 x 4 675 100 8 x 4 6 x. Read duct diameter inches and duct velocity fpm. Enter round duct diameter inches duct airflow cfm duct length and the number of bends.

Rectangular duct is rounded up to the nearest 1 4 inch. As systems increase in efficiency the tolerances of how we have always done it will no longer be adequate. Failure to do so will result in high velocity and very likely loss of airflow.

Include fittings in the duct tel enter either. Enter the desired length of the rectangular duct.