18"W X 36"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 19.75"W X 37.75"H] w36h36 + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 14"w X 10"h is the size for the duct opening measurement only

+ Product Details Size - 26"w X 32"h is the size for the duct opening measurement only

+ Product Details Size - 25"w X 16"h is the size for the duct opening measurement only

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18"W X 36"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 19.75"W X 37.75"H] w36h36 + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 14"w X 10"h is the size for the duct opening measurement only + Product Details Size 26"w X 32"h is the size for the duct opening measurement only