What Size Duct Is Needed For 1000 Cfm

As systems increase in efficiency the tolerances of how we have always done it will no longer be adequate. Most hvac systems use a friction rate of 0 1 water column per 100 feet of duct. As you match each room s cfm to the ductulator it will give you the size of duct you need to run to the room.

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What size duct is needed for 1000 cfm.

A 0 to 400 cfm fan requires a 4 inch minimum duct size but a 6 inch duct is recommended. Design cfm 4 cfm 6 cfm 8 cfm 10 cfm 12 60 6x4 60 4x6 90 4x8 120 4x10 150 4x12 90 8x4 110 6x6 160 6x8 215 6x10 270 6x12 120 10x4 160 8x6 230 8x8 310 8x10 400 8x12 150 12x4 215 10x6 310 10x8 430 10x10 550 10x12 180 14x4 270 12x6 400 12x8 550 12x10 680 12x12 210 16x4 320 14x6 490 14x8 670 14x10 800 14x12 240 18x4 375 16x6 580 16x8 800 16x10 950 16x12 270 20x4 430 18x6 670 18x8 930 18x10 1100. Minimum duct size of 8 recommended duct size of 10 12. 1000 22 x 8 16 x 10 14 x 12 14 1000 1100 24 x 8 18 x 10 16 x 12 15 1100.

Cfm your type of furnace produces. A natural draft furnace produces 100 cmf. 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. If your hood is between 601 and 900 cfm you need a minimum duct size of 7.

Minimum duct size of 4 recommended duct size of 6 401 600 cfm. If your hood is between 401 and 600 cfm you need a minimum duct size of 6. The duct vent size will depend on the size of the furnace and the size of your home so you know how many vents you need in each room. In order for your forced air furnace to work properly you have to have the right sizes of duct vents in each room expelling air.

The minimum duct sizes and recommended duct sizes based on a hood fan s cfm rating are as follows. Shr 80 to 85 19º td ave. If your hood is between 901 and 1200 cfm then you should go for a minimum duct size of 8 and if you have a 1200 cfm hood consider going for a minimum duct size of 10. Humidity 400 cfm ton shr above 85 17º td low humidity 450 cfm ton cfm total heat equation cfm btu hr 4 5 x h x acf sensible load 1 08 x td x acf friction rate used in duct calculators friction rate pressure drop is the available static pressure asp allocated to the duct work.

Duct system sizes and airflow quick chart created date. Approximately 1 cfm of air is required to heat or cool 1 to 1 25 sq. Using your ductulator match each room s cfm requirement to your planned friction rate. Minimum duct size of 7 recommended duct size of 8 10 901 1200 cfm.

In order to maintain velocity reduce duct size. Minimum duct size of 6 recommended duct size of 8 601 900 cfm. Last take off run to be located 12 18 from end.

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