My Lennox oven uses 20 x 20 x 5 filters. I have bought other filters of the same size here at Revain and was very disappointed because there seems to be a lot of fake factors in what various manufacturers consider a 20x20! Other filters left significant gaps (at least 1/2 inch) on the sides of the filter, which made the filter useless as unfiltered air could simply slide around the filter. Why fret! However, these filters fit my Lennox oven like a glove. For about half the price of a real Lennox they fit perfectly, leave no noticeable gaps on the sides and seem to work great. Highly recommended, I would buy them again.
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