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HDX 18 in. x 24 in. x 1 in. Standard Pleated Furnace Air Filter FPR 5, MERV 8 (3-Pack) HDX3P5-011824 - The Home Depot
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Flanders E-Z Flow II - 18'' x 24'' x 1'' - Disposable Filters - MERV 4 - Qty. 12 - Ducting Components - Amazon.com
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