30"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 27.75"h] Ceiling + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 18" OR 18" x 30" duct opening (measured at the opening)

actual front end outer dimensions are approximately 21 5/8" width X 33 5/8" height

+ Product Details Size – 12" x 12" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 8

The vent also has a bug screen to eliminate pest intrusion

30"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 27.75"h] Ceiling + Product Details Perfect Fit+ Product Details Size 30"w X 26"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 31. 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