16"W X 24"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 17.75"W X 25.75"H] Powder Coated + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 16"w X 6"h is the size for the duct opening measurement only

+ Product Details Size – 18" Wooden Corner Baseboard Grille

+ Product Details Size - 25"w X 12"h is the size for the duct opening measurement only

+ Product Details Size – 6"w X 10"h is the size for the duct opening measurement only

75" width X 5

16"W X 24"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 17.75"W X 25.75"H] Powder Coated + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 16"w X 6"h is the size for the duct opening measurement only + Product Details Size – 18" Wooden Corner Baseboard Grille