Duct Size For 1000 Cfm

Multiply that number by the amount of cubic feet of airflow per minute cfm your type of furnace produces.

Duct size for 1000 cfm.

As systems increase in efficiency the tolerances of how we have always done it will no longer be adequate. 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. Table 4 1 supply air duct installation sizes based on 08 inches of pressure drop per 100 ft round duct rectangular duct cfm dia. 100 0 045 4 x 6.

646 3 28 0 16. For example for a natural draft furnace multiply 100 cmf by 100 to get 10 000. A good rule of thumb for estimating duct diameter and cfm requirements is. 1 000 14 14 x 10 18 x 8 12 x 12 1 200 14 16 x 10 24 x 8 14 x 12.

7 to 10 duct 700 to 900 cfm. Air flow dynamics duct sizing reference guide supply or return duct size capacity 09 to 10 pressure drop per 100 el. Duct system sizes and airflow quick chart created date. This equal friction method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications.

A natural draft furnace produces 100 cmf an induced furnace produces 130 cfm and a condensing furnace produces 150 cmf. 8 to 12 duct 900 to 1200 cfm 10 and up duct 1200 and higher cfm. 6 to 8 duct 400 to 600 cfm. Cubic feet per minute cfm m 3 s rectangular duct sizes inches mm x mm equivalent diameter round duct sizes d e inches mm velocity in equivalent round duct v ft min m s friction loss inh 2 o 100 ft duct pa 100m x x 80 0 04 3 x 7 4 x 5.

Equipment sizing load blower cfm equipment sizing load btu hour 1 08 x td x acf. But if the size of your duct matches your ventilation power your kitchen exhaust fan will do its job properly and quietly. Larger volumes or higher static pressures should be dealt with on an individual job basis.