Photo 1 of 16"W x 16"H [Duct Opening Size] Steel Return Air Grille (AGC Series) Vent Cover Grill for Sidewall and Ceiling, White | Outer Dimensions: 17.75"W X 17.75"H for 16x16 Duct Opening 16"W x 16"H [Duct Opening]

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Photo 1 of 16"W x 16"H [Duct Opening Size] Steel Return Air Grille (AGC Series) Vent Cover Grill for Sidewall and Ceiling, White | Outer Dimensions: 17.75"W X 17.75"H for 16x16 Duct Opening 16"W x 16"H [Duct Opening]Photo 2 of 16"W x 16"H [Duct Opening Size] Steel Return Air Grille (AGC Series) Vent Cover Grill for Sidewall and Ceiling, White | Outer Dimensions: 17.75"W X 17.75"H for 16x16 Duct Opening 16"W x 16"H [Duct Opening]