Original message
| dwcaveney
 |  "add return air duct and filter"
, posted Sun 4 Nov 13:42  
I have a Goodman 92K BTU 2 stage, 4 ton FAU. My return grill and filter is 16x25 connected to one 12" and 0ne 6" round return air ducts back to the return plenum approximately 5 feet in lenghth.
Air velocity through the filter is quite loud. The house is old (1930) and not very tight. I would like to put a make-up air duct into the return plenum through a filter located in the basement which is well ventilated and semi conditioned where the FAU is located. The house is located in Marin County California, so I don't think I need to preheat the make-up air.
Is this a good idea; will it work: how will it affect efficiency? Appreciate any input. Thanks
Dan
Daniel
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Replies:
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| smythers1968
| "Re(1):add return air duct and filter" , posted Sun 4 Nov 20:18
You most diffently need more return air. You do not have enough if I understand you right. Only a 12" and a 6" connected to a 16X25 grill.
You need atleast two more 12" added.
For a 4 tn system you need 1600 cfm you are not even 900 cfm
Life lesson #12 Know when not to do it yourself.
WOW That Can Hurt!!
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