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Handua 20"W x 20"H [Duct Opening Size] Steel Return Air Filter Grille [Removable Door] for 1-inch Filters | Vent Cover Grill, White | Outer Dimensions: 22 5/8"W X 22 5/8"H for 20x20
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Filtrete 20-in W x 20-in L x 1-in 2-Pack Basic Flat Air Filter in the Air Filters department at Lowes.com
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