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If the filter is missing or unreadable, check your indoor unit’s manual for the required dimensions.

Measure the filter compartment's height, width, and depth with a tape measure. Round these up to the nearest whole inch to find the nominal size. 2. Choose the Right Filter Type & Efficiency buy carrier ac filters

Look at the side of your current filter; the nominal size (e.g., 20"x25"x1") is usually printed there. If the filter is missing or unreadable, check