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Old 04-16-2011, 12:17 AM   #1
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Adapting round duct to square media filter?


Hopefully an easy question - what is the best way to transition my two 16" dia flex return air ducts to two 20x25" media filters I plan to mount to the return air plenum? Do I need to have a sheetmetal shop fabricate transition fittings, or is there some off-the-shelf item that I could use?

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Old 04-16-2011, 10:14 AM   #2
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Adapting round duct to square media filter?


While sq/rectangular to round is a stock item, not all places will have the size you want. Might be best to just have the size you want made to the length you want.

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Old 04-16-2011, 11:33 AM   #3
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Adapting round duct to square media filter?


Thanks beenthere! Would it be too crude to use a 20 x 25 x 4" sheetmetal return air box (my supplier stocks these) and just make a 16" round opening in the face and attach a starting collar and a duct to it? It would not be much of a "transition" obviously, more like an "adapter"...
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Old 04-16-2011, 01:04 PM   #4
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Adapting round duct to square media filter?


Reduces air flow when that is done.
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Old 04-16-2011, 01:42 PM   #5
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Adapting round duct to square media filter?


Yup, I figured that . I'll see what I can round up from the sheet metal shop. Thanks!
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