18"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Brown [Outer Dimensions 19.75"w x 25.75"h] Color_Aluminum this flex duct decreases the

this flex duct decreases the pressure loss and provides a more hygienic environment

Featuring a multi-shutter damper with an easy-access lever

+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 8" or 8" x 14" duct opening (measured at the opening)

+ How To Measure A Grille Overall Size:

Ideal for Walls & Ceilings: Designed for seamless installation in standard 14" X 6" duct openings

18"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Brown [Outer Dimensions 19.75"w x 25.75"h] Color_Aluminum this flex duct decreases the+ Product Details Size 18"w X 24"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 19. 75" Width X 25. 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