20"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 19.75"h] 8" Round Duct Pipe 75"H – fits a 12"

75"H – fits a 12" X 8" duct opening

+ Product Details Size – 26" x 30" or 30" x 26" is the size for the duct opening measurement only

(Screws included)

reducing energy costs and maximizing HVAC system lifespan

actual front end outer dimensions are approximately 28 5/8" width X 28 5/8" height

20"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 19.75"h] 8" Round Duct Pipe 75"H – fits a 12"+ Product Details Size 20"w X 18"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 21. 75" Width X 19. 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