Before searching, you must identify the (the rounded dimensions printed on the filter frame). Check the current filter : Look for numbers like 16x25x1 .

: Filters are often 1/4" to 1/2" smaller than the printed size to ensure they slide in easily. 2. Choose Your MERV Rating

: If no label exists, measure the filter slot's length, width, and depth.

The rating tells you how well a filter captures particles on a scale of 1–16. The Ultimate Guide to Air Filter Sizes - Colorfil