18"w X 14"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 15.75"h] 10in diameter Actual Filter Size – 27

Actual Filter Size – 27 3/4"w x 21 3/4" x 1"

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

actual front end outer dimensions are approximately 26 5/8" width X 38 5/8" height

+ Product Details Size - 24"w X 30"h is the size for the duct opening measurement only

18"w X 14"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 15.75"h] 10in diameter Actual Filter Size – 27+ Product Details Size 18"w X 14"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 19. 75" Width X 15. 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