What Size Round Duct For 1000 Cfm

The table below can be used to compare equivalent diameters for rectangular and round circular ducts.

What size round duct for 1000 cfm.

Never locate ducts at the end of the trunk line run. For example for a natural draft furnace multiply 100 cmf by 100 to get 10 000. The minimum duct sizes and recommended duct sizes based on a hood fan s cfm rating are as follows. 810 cold air boot collar duct 45 65 el air flow dynamics duct sizing reference guide supply or return duct size capacity 09 to 10 pressure drop per 100 el.

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. The chart is based on metal duct. Duct elbows square throat no. Last take off run to be located 12 18 from end.

1000 22 x 8 16 x 10 14 x 12 14 1000. A 0 to 400 cfm fan requires a 4 inch minimum duct size but a 6 inch duct is recommended. Minimum duct size of 4 recommended duct size of 6. Proline s prov models come with an external blower option.

16 up to 11 40 el 12 to 15 55 el 16 to 21 75 el 22 to 27 100 el 28 to 33 125 el return air system no. A natural draft furnace produces 100 cmf an induced furnace produces 130 cfm and a condensing furnace produces 150 cmf. We also recommend a 1000 1200 cfm rooftop blower. Duct system sizes and airflow quick chart created date.

Over a 48 inch range a 54 or 60 kitchen range hood is ideal to ensure full coverage over her cooktop. The rectangular dimensions and the air flow volume are adapted to the equal friction loss. The table is based on the ducts friction loss formula. The equivalent diameter is the diameter of a circular duct or pipe that gives the same pressure loss as an equivalent rectangular duct or pipe.

As systems increase in efficiency the tolerances of how we have always done it will no longer be adequate. Flex duct has a higher pressure drop and as such may require the size shown on this guide be increased by 1 round size for up to 800 cfm and 2 round sizes above 800 cfm to insure proper airflow. Multiply that number by the amount of cubic feet of airflow per minute cfm your type of furnace produces.