20"w X 34"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 35.75"h] 14" Round Duct Pipe + Product Details Size -

+ Product Details Size - 10"w X 8"h X 2"d (for duct opening measurement only)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 16" OR 16" X 18" duct opening (measured at the opening)

75" Width X 37

Design – Designed to withstand bends and sharp turns without kinking

Design – 180 degrees double direction adjustable - fins are manually adjustable individually for optimal air distribution

20"w X 34"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 35.75"h] 14" Round Duct Pipe + Product Details Size -+ Product Details Size 20"w X 34"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 21. 75" Width X 35. 75" Height Weather and Pest Proof These louvers are especially designed to prevent water from entering your home, and with a built in back 1 2" mesh they also protect you from annoying rodents like mice, rats, birds, and squirrels High Quality Aluminum The premium durable aluminum will never rust and it will never