30"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 9.75"h] w20h20 + Product Details Size –

+ Product Details Size – 20"w X 25"h is the size for the duct opening measurement only

High diffusion induction rates result in rapid temperature and velocity equalization of the mixed air mass well above the zone of occupancy

+ Product Description Introducing the 8" Radial Damper – Your Solution for Controlled Airflow

This grill comes in four different designs

actual front end outer dimensions are approximately 34 5/8" width X 26 5/8" height

30"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 9.75"h] w20h20 + Product Details Size –+ Product Details Size 30"w X 8"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 31. 75" Width X 9. 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