Photo 1 of 30"W x 12"H [Duct Opening Measurements] Filter Included Steel Return Air Filter Grille [Removable Door] for 1" Filters, Vent Cover Grill, White, Outer Dimensions: 32 5/8"W X 14 5/8"H for 30x12 Opening Duct Opening Size: 30"x12"

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Photo 1 of 30"W x 12"H [Duct Opening Measurements] Filter Included Steel Return Air Filter Grille [Removable Door] for 1" Filters, Vent Cover Grill, White, Outer Dimensions: 32 5/8"W X 14 5/8"H for 30x12 Opening Duct Opening Size: 30"x12"Photo 2 of 30"W x 12"H [Duct Opening Measurements] Filter Included Steel Return Air Filter Grille [Removable Door] for 1" Filters, Vent Cover Grill, White, Outer Dimensions: 32 5/8"W X 14 5/8"H for 30x12 Opening Duct Opening Size: 30"x12"Photo 3 of 30"W x 12"H [Duct Opening Measurements] Filter Included Steel Return Air Filter Grille [Removable Door] for 1" Filters, Vent Cover Grill, White, Outer Dimensions: 32 5/8"W X 14 5/8"H for 30x12 Opening Duct Opening Size: 30"x12"