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18 x 20 x 1 Furnace Filter - Pack of 6 - Walmart.com
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Filtrete 18 In. x 20 In. x 1 In. 1000 MPR Allergen Defense Furnace Filter, MERV 11 - Anderson Lumber
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HDX 18 in. x 20 in. x 1 in. Standard Pleated Furnace Air Filter FPR 5, MERV 8 (3-Pack) HDX3P5-011820 - The Home Depot
HDX 18 in. x 20 in. x 1 in. Standard Pleated Furnace Air Filter FPR 5, MERV 8 (3-Pack) HDX3P5-011820 - The Home Depot
Honeywell 18x20x1 Furnace Air Filter MERV 11 - 12 Pack
Filtrete 18-in W x 18-in L x 1-in MERV 5 Basic Pleated Air Filter (3-Pack) in the Air Filters department at Lowes.com
12 Pack of 18 x 20 x 1 Merv 10 Pleated Air Filters for AC & Furnace - Walmart.com
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18" x 21" x 1" MERV 8 Air Filters - Only $16.59/ea.
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