20"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 21.75"h] Color_White + Product Details Size – Product Description Enhance your CRFG68 Victorian Floor Registers

+ Product Details Size – 8"w X 12"h is the size for the duct opening measurement only

+ Product Details Size – 29"w X 22"h is the size for the duct opening measurement only

+ Product Details Size - 6"w X 28"h is the size for the duct opening measurement only

All of these grills have dampers

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20"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 21.75"w x 21.75"h] Color_White + Product Details Size – Product Description Enhance your CRFG68 Victorian Floor Registers + Product Details Size – 8"w X 12"h is the size for the duct opening measurement only + Product Details Size – 29"w X 22"h is the size for the duct opening measurement only