18"w X 28"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 29.75"h] Color_R-4.2 Yellow Ideal for Walls & Ceilings:

Ideal for Walls & Ceilings: Designed for seamless installation in standard 30" X 6" duct openings

Actual Filter Size – 11 3/4"w x 9 3/4" x 1"

+ Product Spec Sheet Round Ceiling Diffuser Spec Sheet

this grille offers durability and resistance to rust and corrosion

+ Product Description Upgrade your ventilation with our premium grilles and registers

18"w X 28"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 29.75"h] Color_R-4.2 Yellow Ideal for Walls & Ceilings:+ Product Details Size 18"w X 28"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 19. 75" Width X 29. 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