Flex Duct Cfm Ratings

Use the online duct calculator see references and calculate the needed flex duct size.

Flex duct cfm ratings.

Other radii and vaned elbows are available as needed. All hart cooley flexible duct products are performance tested in accordance with industry standards to ensure reliability and years of service. 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. They should not be located in the same area as the furnace nor.

Returns are located on inside walls. You must have 400 cfm of air flow per ton of a c 1 ton equals 12 000 btu approximately 1 cfm of air is required to heat or cool 1 to 1 25 sq. Our core is tested in accordance with adc fd 72 r1 for actual installation static pressure temperature performance and meets the ratings specified in our catalog. Select the duct type on the pull down menu.

Standard elbows will have 1 5 centerline radius. As systems increase in efficiency the tolerances of how we have always done it will no longer be adequate. Enter the desired length of the rectangular duct. The flex duct size may be different than the hard duct that runs to that room.

Input the required cfm in the box below that. Enter round duct diameter inches duct airflow cfm duct length and the number of bends. 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. Enter round duct diameter.

Duct work supplies are located on outside walls. Our polyester cores are also. All round spiral duct and fittings shall be manufactured from g 90 galvanized steel conforming to astm and smacna standards. Read duct diameter inches and duct velocity fpm.

Read friction loss inches of water and duct velocity fpm. Elbows through 12 shall be die formed with stitch welded joints. Based on duct diameter. Click calculate and you will see the size of flex duct you need for that room.