6"w X 22"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 7.75"w x 23.75"h] 12" Round Duct Pipe 75"H – fits a 20"

75"H – fits a 20" X 18" duct opening

actual front end outer dimensions are approximately 20 5/8" width X 38 5/8" height -

actual front end outer dimensions are approximately 38 5/8" width X 16 5/8" height -

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6"w X 22"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 7.75"w x 23.75"h] 12" Round Duct Pipe 75"H – fits a 20"+ Product Details Size 6"w X 22"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 7. 75" Width X 23. 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 wear