34"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 35.75"w x 25.75"h] 10" Diameter 75"H – fits a 18"

75"H – fits a 18" X 6" duct opening

+ Product Details Size – 16" x 26" or 26" x 16" is the size for the duct opening measurement only

Actual Filter Size – 19 3/4"w x 24 3/4" x 1"

+ Product Details Size – 30"w X 18"h is the size for the duct opening measurement only

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34"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 35.75"w x 25.75"h] 10" Diameter 75"H – fits a 18"+ Product Details Size 34"w X 24"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 35. 75" Width X 25. 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