6"W X 20"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 7.75"W X 21.75"H] Powder Coated + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 30"w X 16"h is the size for the duct opening measurement only

+ Product Details Size - 24"w X 6"h is the size for the duct opening measurement only

+ Product Details Size - 20"w X 34"h is the size for the duct opening measurement only

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75" width X 3

6"W X 20"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 7.75"W X 21.75"H] Powder Coated + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 30"w X 16"h is the size for the duct opening measurement only + Product Details Size 24"w X 6"h is the size for the duct opening measurement only