Flex Duct Cfm Ratings

Enter round duct diameter inches duct airflow cfm duct length and the number of bends.

Flex duct cfm ratings.

Our polyester cores are also. The flex duct size may be different than the hard duct that runs to that room. Elbows 14 through 30 shall be. All hart cooley flexible duct products are performance tested in accordance with industry standards to ensure reliability and years of service.

Other radii and vaned elbows are available as needed. Read duct diameter inches and duct velocity fpm. They should not be located in the same area as the furnace nor. Input the required cfm in the box below that.

Duct work supplies are located on outside walls. Enter round duct diameter. 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. Returns are located on inside walls.

Elbows through 12 shall be die formed with stitch welded joints. 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. 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.

Enter the desired length of the rectangular duct. Total effective length feet 05 06 08 10 125 14 16 18 20 25 30 34 375 40 50 625 75 1 00 35 44 13 15 20 25 32 35 40 45 50 63 75 85 95 1 00 1 25 1 50 1 90 2 54. Use the online duct calculator see references and calculate the needed flex duct size. 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.

As systems increase in efficiency the tolerances of how we have always done it will no longer be adequate. Based on duct diameter. Read friction loss inches of water and duct velocity fpm. Standard elbows will have 1 5 centerline radius.