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17.5" x 20" x 4" MERV 8 Air Filters - Only $24.10/ea.
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Nordic Pure 18x20x1 (17 1/2 x 19 1/2 x 3/4) Pleated MERV 10 Air Filters 6 Pack - Replacement Furnace Filters - Amazon.com
17x20-3/4x1 Exact Filters Pleated MERV 8 (12 pack)
Buy 17.5x21x4.5 Ruud® Furnace Filters by Accumulair® | AirFilters.com
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HDX 18 in. x 20 in. x 1 in. Superior Pleated Air Filter FPR 9, MERV 12 HDX1P9-011820 - The Home Depot
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