40"W X 20"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 41.75"W X 21.75"H] w18h18 creating a quiet and efficient 4 X 12 Is CRFG2028 Width_14in

creating a quiet and efficient environment

+ Product Details Size - 18"w X 32"h is the size for the duct opening measurement only

+ Product Details Size - 30"w X 4"h is the size for the duct opening measurement only

+ Product Details Size - 10"w X 34"h is the size for the duct opening measurement only

+ Product Details Size - 36"w X 10"h is the size for the duct opening measurement only

40"W X 20"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 41.75"W X 21.75"H] w18h18 creating a quiet and efficient 4 X 12 Is CRFG2028 Width_14in creating a quiet and efficient environment + Product Details Size 18"w X 32"h is the size for the duct opening measurement only