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Old 07-24-2008, 08:10 AM   #1
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return duct


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

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Old 07-24-2008, 04:11 PM   #2
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return duct


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

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Old 07-26-2008, 08:53 AM   #3
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return duct


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.

Last edited by 8 Ball; 07-26-2008 at 08:57 AM.
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Old 08-01-2008, 01:16 PM   #4
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return duct


"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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