Photo 1 of 30"W x 12"H [Duct Opening Size] Steel Return Air Grille (AGC Series) Vent Cover Grill for Sidewall and Ceiling, White | Outer Dimensions: 31.75"W X 13.75"H for 30x12 Duct Opening 30"W x 12"H [Duct Opening]

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Photo 1 of 30"W x 12"H [Duct Opening Size] Steel Return Air Grille (AGC Series) Vent Cover Grill for Sidewall and Ceiling, White | Outer Dimensions: 31.75"W X 13.75"H for 30x12 Duct Opening 30"W x 12"H [Duct Opening]Photo 2 of 30"W x 12"H [Duct Opening Size] Steel Return Air Grille (AGC Series) Vent Cover Grill for Sidewall and Ceiling, White | Outer Dimensions: 31.75"W X 13.75"H for 30x12 Duct Opening 30"W x 12"H [Duct Opening]