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Filtrete 18-in W x 30-in L x 1-in MERV 5 Basic Pleated Air Filter (3-Pack) in the Air Filters department at Lowes.com
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K&N HVC-11830 HVAC Filter; 18 x 30 x 1
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Honeywell 18 x 30 x 1 in. Allergen + Pleated Air Filter MERV 11 FPR 7 Value Pack | eBay
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Ace 18 in. W X 30 in. H X 1 in. D Synthetic 8 MERV Pleated Air Filter 1 pk - Ace Hardware
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AAF Flanders 10055.01183 Fiberglass Furnace Filter 18 x 30 x 1 in. (Pack of 12) - Walmart.com
Pleated Filter, 18 x 30 x 1, MERV 13 (A02654-007, Unico)
HDX 18 in. x 30 in. x 1 in. Elite Allergen Pleated Air Filter FPR 12, MERV 13 61201.011830 - The Home Depot
