18"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 21.75"h] Grille 75"H – fits a 24"

75"H – fits a 24" X 4" duct opening

Rigid design with noise free components - quiet airflow

+ Product Details Size – 24"w X 26"h is the size for the duct opening measurement only

+ Product Details Size – 20"w X 36"h is the size for the duct opening measurement only

+ Product Spec Sheet Aluminum Return Filter Grille Spec Sheet

18"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 21.75"h] Grille 75"H – fits a 24"+ Product Details Size 18"w X 20"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 19. 75" Width X 21. 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