36"w X 28"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 29.75"h] 18in diameter Actual Filter Size – 11

Actual Filter Size – 11 3/4"w x 33 3/4" x 1"

+ Product Details Size - 16"w X 18"h X 2"d (for duct opening measurement only)

actual front end outer dimensions are 19" Width X 11" Height

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

thanks to counter-sunk screw holes and included screws

36"w X 28"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 29.75"h] 18in diameter Actual Filter Size – 11+ Product Details Size 36"w X 28"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 37. 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