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

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

: The HVAC owner's manual lists the exact required size. The rating tells you how well a filter

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