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Thread: Help Needed: 1" Gap with airfilter on Rheem Criterion II

  1. #1

    Default Help Needed: 1" Gap with airfilter on Rheem Criterion II

    Posted by: thogue

    I have a Rheem Criterion II configured in a down flow configuration. The filters are above the blower fan as the air is coming from the ceiling and the heated/cooled air blows down into the vents under the floor. The problem that I am having is that the filters that are in there are 12x20x1 and there is a 1" gap when installed. The 12x24x1 filters would be too big and not fit and there are no 12x21x1 filters available. Is my plenum missing a 1" spacer? I am thinking about putting in some 1x1" square wood spacers but not sure if that is safe. There should not be any heat in that space so any advice is much needed and welcome.

    Help Needed: 1" Gap with airfilter on Rheem Criterion II-image_1044-jpg

  2. #2
    Join Date
    Feb 2012
    Location
    Kent, WA
    Posts
    249

    Default

    How large is your furnace (any idea in tons if air conditioning or BTU if heating)? It could be you need 2 filters in a teepee or upside down V shape and you're missing the middle rest for the top of the filters. If 12x21 is the correct size, then adding wood rests around the perimeter shouldn't be an issue. But a single 12x20 filter won't support much air flow so it doesn't seem like the proper size unless you have a small furnace.




  3. #3

    Default

    Never mind...I found the size on Amazon.

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