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HDX 20 in. x 36 in. x 1 in. Standard Pleated Air Filter FPR 5, MERV 8 (3-Pack) HDX3P5-012036 - The Home Depot
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Filtrete 20x36x1 Air Filter MPR 1000 MERV 11, Allergen Defense, 6-Pack (exact dimensions 19.81x 35.81x0.81) - Amazon.com
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