Photo 1 of 14"W x 14"H [Duct Opening Measurements] Steel Return Air Grille (HD Series) Vent Cover Grill for Sidewall and Ceiling, White | Outer Dimensions: 15.75"W X 15.75"H for 14x14 Duct Opening Duct Opening Size: 14"x14"

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Photo 1 of 14"W x 14"H [Duct Opening Measurements] Steel Return Air Grille (HD Series) Vent Cover Grill for Sidewall and Ceiling, White | Outer Dimensions: 15.75"W X 15.75"H for 14x14 Duct Opening Duct Opening Size: 14"x14"Photo 2 of 14"W x 14"H [Duct Opening Measurements] Steel Return Air Grille (HD Series) Vent Cover Grill for Sidewall and Ceiling, White | Outer Dimensions: 15.75"W X 15.75"H for 14x14 Duct Opening Duct Opening Size: 14"x14"