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Old 03-17-2013, 02:21 PM   #1
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How to use fiberboard as a duct return

I'm trying to understand how the supply and the return ducts connect on my home central air. I can see that the fiberboard is taped to the joist to create a plenum, but then how does that connect to the main return plenum hanging from the joists?

I assume that there is a hole cut on the top side of the return plenum right where the return duct would be for each room return. Is it just a matter of taping the return duct to the return plenum?

Next question is that I have an 8' section of return coming off the blower unit (which is on one side of the house center support beam) and then a 40' return plenum on the other side of the support beam thats against the supply plenum. It goes return plenum, beam, supply plenum and the return plenum. As far as I can see there is only one bay in between the joists that runs from the small return plenum over to the longer return plenum. Is a 16x10 area big enough to connect to a 21x9 main return plenum?



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Old 03-17-2013, 04:29 PM   #2
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Post pics of the duct layout. It will be easier for us to understand what your describing.


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