8"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 13.75"h] Compatible With Duct 8in Designed with two mounting base

Designed with two mounting base options—solid and ring—it offers flexible installation

actual front end outer dimensions are approximately 22 5/8" width X 24 5/8" height

+ Product Details Size - 30"w X 36"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 34" x 34" duct opening (measured at the opening)

8"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 13.75"h] Compatible With Duct 8in Designed with two mounting base+ Product Details Size 8"w X 12"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 9. 75" Width X 13. 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 wear