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Old 10-07-2011, 03:22 PM   #1
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return air general questions

Alright just some general education questions for me to undestand better why things are done certain ways

1) Shouldn't the return velocity be lower then the supply? wouldn't a lower velocity help make the filter system work better and not pull smaller particles forcefully through the filter?

2) Why are return trunks generally smaller then the supply plenum's total area? wouldn't you want to follow something like I asked about in #1?

if these are correct or good ideas, why does it seem like returns always have such a small total square area?


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Old 10-07-2011, 09:41 PM   #2
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because somewhere along the line. installers started to think that since the return is a negative pressure, it does have as much of a resistance to flow in the return duct.


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Old 10-07-2011, 09:46 PM   #3
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it also pulls from any place thru louvered door across rooms,up stairs cases ducted unducted and the best place to mount the stat at eye level to control a space with the return air
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