6"W X 18"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 7.75"W X 19.75"H] Adjustable Return + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 16"w X 32"h is the size for the duct opening measurement only

+ Product Details Size - 32"w X 36"h is the size for the duct opening measurement only

+ Product Details Size - 32"w X 25"h is the size for the duct opening measurement only

4" X 12" Is The Size For The Duct Opening (floor/vent hole) Measurement Only

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6"W X 18"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 7.75"W X 19.75"H] Adjustable Return + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 16"w X 32"h is the size for the duct opening measurement only + Product Details Size 32"w X 36"h is the size for the duct opening measurement only