Flexible Duct Cfm Chart

Friction rate velocity friction rate. 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. Friction loss calculator for sheet metal ducts.

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Flex Duct Sizing Chart Lovely Duct Size Vs Airflow Part 1

Kea General Information Sizing Within Flex Duct Sizing Chart 24391

Duct Sizing Chart Gallery Of Chart 2019

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.

Flexible duct cfm chart. Input the required cfm in the box below that. Rectangular duct is rounded up to the nearest 1 4 inch. 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.

Include fittings in the duct tel enter either. Enter the desired length of the rectangular duct. Friction loss calculator for flexible ducts.

As systems increase in efficiency the tolerances of how we have always done it will no longer be adequate. 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.

Based on duct diameter. Sheet metal duct friction loss calculator. Enter round duct diameter inches duct airflow cfm duct length and the number of bends.

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. Equivalent duct calculator round vs rectangular. Other hart cooley mobile tools.

The flex duct size may be different than the hard duct that runs to that room. Select the duct type on the pull down menu. Click calculate and you will see the size of flex duct you need for that room.

This equal friction method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications. In wg duct tel. Read duct diameter inches and duct velocity fpm.

Enter round duct diameter. Metal ductboard flex size by. Read round duct diameter inches and friction loss per 100 of duct inches of water.

Larger volumes or higher static pressures should be dealt with on an individual job basis. Enter duct airflow cfm duct velocity fpm duct length and the number of bends. Use the online duct calculator see references and calculate the needed flex duct size.

Duct system sizes and airflow quick chart created date.