A/C Return Air Calculations

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May 10, 2008, 04:20 PM

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Join Date: May 2008

Posts: 1

A/C Return Air Calculations

Can anyone provide the formula for calculating the return air register size on home a/c units. Thanks.

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May 10, 2008, 05:07 PM	#2

Heating & Air Conditioning Expert

Join Date: Aug 2005

Location: Ohio

Posts: 5,001

Quote:

Originally Posted by rodneycwhitney

Can anyone provide the formula for calculating the return air register size on home a/c units. Thanks.

THESE ARE OLD STANDARDS. They are generic in nature. A manual D is the proper way to determine duct/return air size. Use with caution.

http://www.karg.com/PDF%20files/Pres...Wis%202003.pdf

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