21 x 23 x 5": What brand are you looking for?

21 x 23 x 5" Trane 21 X 23 X 5" Air Filters        

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Why is the brand important?
Many filters marked 21 x 23 x 5" have subtle differences that make them incompatible with other brands or air cleaner models. By selecting your filter or air cleaner brand from the list we can limit your selection to only those filters we know to be compatible.

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