18"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 37.75"h] w16h16 + Product Details Size – Product Description Enhance your CRFG68 Victorian Floor Registers

+ Product Details Size – 20"w X 22"h is the size for the duct opening measurement only

+ Product Details Size - 8"w X 36"h is the size for the duct opening measurement only

The installation process is a breeze

+ Product Details Size - 14"w X 34"h X 2"d (for duct opening measurement only)

Rigid Built For External Use– The sturdy and rigid design features noise free components that eliminates vibration and excess noise to the louvers

18"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 19.75"w x 37.75"h] w16h16 + Product Details Size – Product Description Enhance your CRFG68 Victorian Floor Registers + Product Details Size – 20"w X 22"h is the size for the duct opening measurement only + Product Details Size 8"w X 36"h is the size for the duct opening measurement only