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heatdude 07-24-2008 08:10 AM

return duct
just trying to get a idea of about how much return air is needed for 1-4 ton systems

Termite 07-24-2008 04:11 PM

Too general of a question. It depends on supply duct size, quantity, length, house size, etc.........

8 Ball 07-26-2008 08:53 AM

Way too general. At least 400-1600cfm. Return air is pretty much dependent on the Local or State Mechanical Codes, per sq. in. per cfm..

Velocity is not equal to supply velocity.

General question=general answer.

rosehillraymond 08-01-2008 01:16 PM

"just trying to get a idea....."
A rule of thumb frequently used is: "the supply air should be adjusted to obtain a minimum of 400 cfm per ton". SO, return air is, in a rule of thumb way, also 400 cfm per ton.

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