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Aerostar 13x21 1/2x1 MERV 8, Pleated Air Filter, 13 x 21 1/2 x 1, Box of 4, Made in The USA - Amazon.com
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13 X 21-1/2 X 1 Lifetime Air Filter - Electrostatic Washable Permanent A/C Furnace Air Filter. 65% More Efficiency - China Nylon Filter, Air Filter | Made-in-China.com
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Filter King Air Filters | 13x21x1 | 4-PACK | MERV 11 HVAC Pleated AC Furnace Filters | Actual Size 13 x 21 x .75" - Amazon.com
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HDX 21 in. x 21 in. x 1 in. Elite Allergen Pleated Air Filter FPR 12, MERV 13 61201.012121 - The Home Depot
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