10"W X 28"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 11.75"W X 29.75"H] flat stamped steel + Product Details Size - Product Description Enhance your CRFG68 Victorian Floor Registers

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

+ Product Details Size - 32"w X 20"h is the size for the duct opening measurement only

+ Product Details Size - 40"w X 20"h is the size for the duct opening measurement only

+ Product Details Size - 20"w X 36"h is the size for the duct opening measurement only

+ Product Details Size – 6"w X 14"h is the size for the duct opening measurement only

10"W X 28"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 11.75"W X 29.75"H] flat stamped steel + Product Details Size Product Description Enhance your CRFG68 Victorian Floor Registers + Product Details Size 20"w X 34"h is the size for the duct opening measurement only + Product Details Size 32"w X 20"h is the size for the duct opening measurement only