Photo 1 of 24"W x 20"H [Duct Opening Measurements] Filter Included Steel Return Air Filter Grille [Removable Door] for 1" Filters, Vent Cover Grill, White, Outer Dimensions: 26 5/8"W X 22 5/8"H for 24x20 Opening Duct Opening Size: 24"x20"

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Photo 1 of 24"W x 20"H [Duct Opening Measurements] Filter Included Steel Return Air Filter Grille [Removable Door] for 1" Filters, Vent Cover Grill, White, Outer Dimensions: 26 5/8"W X 22 5/8"H for 24x20 Opening Duct Opening Size: 24"x20"Photo 2 of 24"W x 20"H [Duct Opening Measurements] Filter Included Steel Return Air Filter Grille [Removable Door] for 1" Filters, Vent Cover Grill, White, Outer Dimensions: 26 5/8"W X 22 5/8"H for 24x20 Opening Duct Opening Size: 24"x20"