View 2 of 20x20 Return Air Grille (Duct Opening Size), Air Return Vent Cover, AC Vent Cover, Cold Air Return Vent Cover, Flat Return Air Grilles, Outer Dimensions:21.75"W x 21.75"H (20"W x 20"H, Duct Opening)

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View 1 of 20x20 Return Air Grille (Duct Opening Size), Air Return Vent Cover, AC Vent Cover, Cold Air Return Vent Cover, Flat Return Air Grilles, Outer Dimensions:21.75"W x 21.75"H (20"W x 20"H, Duct Opening)View 2 of 20x20 Return Air Grille (Duct Opening Size), Air Return Vent Cover, AC Vent Cover, Cold Air Return Vent Cover, Flat Return Air Grilles, Outer Dimensions:21.75"W x 21.75"H (20"W x 20"H, Duct Opening)