I have 14 x 25 x 1 bought. The filter size was 13 1/2 inches. It was so small that I had to leave the filter there while I closed the grate. It's difficult when he's on a 9 foot ceiling. I measured my Filtrete brand filter and its 13 3/4 inches and it sits comfortably there. I doubt these filters will do anything if air is allowed to enter the sides if it enters freely. Very disappointed.
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