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Convert rectangular duct to round equivalent.
Hvac duct calculator chart. Read duct diameter inches and duct velocity fpm. Rectangular duct is rounded up to the nearest 1 4 inch. Read round duct diameter inches and friction loss per 100 of duct inches of water.
Based on duct diameter. 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. Sheet metal duct friction loss calculator.
Enter the desired length of the rectangular duct. Enter round duct diameter. Enter round duct diameter inches duct airflow cfm duct length and the number of bends.
Calculations are for 60 f dry air at sea level from 5 to 3000 cfm approximately standard air which is 0 075lb da ft. Read friction loss inches of water and duct velocity fpm. Friction rate velocity friction rate.
Include fittings in the duct tel enter either. In wg duct tel. 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.
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