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TIL that 4 inch furnace air filter vary in size. This $40 4” filter is 3/8” too big. : r/mildlyinfuriating
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Why Does Furnace Filter Thickness Matter?
20x25x4 MERV 13 ( MPR 2200 ) AC Furnace 4" Inch Air Filters by Glasfloss Industries. 6 Pack. Actual Size: 19-1/2" x 24-1/2" x 3-3/4" - Walmart.com
