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HDX 12 in. x 20 in. x 1 in. Standard Pleated Furnace Air Filter FPR 5, MERV 8 (3-Pack) HDX3P5-011220 - The Home Depot
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20x25x1 MERV 10 (FPR 5-6) Pleated Air Filters By Glasfloss. Box of 6. Actual Size: 19-1/2 x 24-1/2 x 7/8 - Amazon.com
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Filtrete 20-in W x 20-in L x 2-in MERV 8 Allergen Defense Electrostatic Pleated Air Filter in the Air Filters department at Lowes.com
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Amazon.com: 21-1/2 x 23-5/16 x 1 MERV 10 Pleated Air Filters by Glasfloss. 4 Pack. Replacement filters for Carrier, Payne, & Bryant. : Everything Else
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