34"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 35.75"w x 21.75"h] 2-Way actual front end outer dimensions

actual front end outer dimensions are approximately 20 5/8" width X 26 5/8" height

+ Product Details Size – 18"w X 16"h is the size for the duct opening measurement only

75"H – fits a 16" X 6" duct opening

Actual Filter Size – 13 3/4"w x 23 3/4" x 1"

34"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 35.75"w x 21.75"h] 2-Way actual front end outer dimensions+ Product Details Size 34"w X 20"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 35. 75" Width X 21. 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