32"W X 28"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 33.75"W X 29.75"H] Filter Grille + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 18"w X 34"h is the size for the duct opening measurement only

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+ Product Details Size - 22"w X 28"h is the size for the duct opening measurement only

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

+ Product Details Size - 25"w X 28"h is the size for the duct opening measurement only

32"W X 28"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 33.75"W X 29.75"H] Filter Grille + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 18"w X 34"h is the size for the duct opening measurement only accordion dd ul li { margin bottom: 6px