18"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 27.75"h] w12h12 Actual Filter Size – 21

Actual Filter Size – 21 3/4"w x 13 3/4" x 1"

actual front end outer dimensions are approximately 27 5/8" width X 16 5/8" height

Screws Included

+ Product Details Size – 6"w X 8"h is the size for the duct opening measurement only

+ Product Details Size - 24"w X 34"h is the size for the duct opening measurement only

18"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 27.75"h] w12h12 Actual Filter Size – 21+ Product Details Size 18"w X 26"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 19. 75" Width X 27. 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