Duct Size For 1000 Cfm

A natural draft furnace produces 100 cmf an induced furnace produces 130 cfm and a condensing furnace produces 150 cmf.

Duct size for 1000 cfm.

Larger volumes or higher static pressures should be dealt with on an individual job basis. As systems increase in efficiency the tolerances of how we have always done it will no longer be adequate. 8 to 12 duct 900 to 1200 cfm 10 and up duct 1200 and higher cfm. 7 to 10 duct 700 to 900 cfm.

6 to 8 duct 400 to 600 cfm. 1 000 14 14 x 10 18 x 8 12 x 12 1 200 14 16 x 10 24 x 8 14 x 12. A good rule of thumb for estimating duct diameter and cfm requirements is. 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.

Equipment sizing load blower cfm equipment sizing load btu hour 1 08 x td x acf. Air volume equivalent round air volume cfm 4 6 8 10 12 duct inches cfm 50 6 x 4 550 75 6 x 4 675 100 8 x 4 6 x. Table 4 1 supply air duct installation sizes based on 08 inches of pressure drop per 100 ft round duct rectangular duct cfm dia. This equal friction method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications.

100 0 045 4 x 6. For example for a natural draft furnace multiply 100 cmf by 100 to get 10 000. Wxh wxh wxh wxh wxh wxh wxh wxh 80 8x4 90 8x4 100 6 6x6 7x5 9x4 125 7x6 8x5 10x4 150 8x6 9x5 11x4 175 7 7x7 9x6 11x5 13x4 200 8x8 8x7 9x6 12x5 15x4. 646 3 28 0 16.

Duct system sizes and airflow quick chart created date. Air flow dynamics duct sizing reference guide supply or return duct size capacity 09 to 10 pressure drop per 100 el. Multiply that number by the amount of cubic feet of airflow per minute cfm your type of furnace produces.