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 actual front end outer dimensions

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

+ Product Details Size - 36"w X 20"h X 2"d (for duct opening measurement only)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 36" x 26" OR 26" x 36" duct opening (measured at the opening)

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

This grill comes in four different designs

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 actual front end outer dimensions+ 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