6"w X 30"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 7.75"w x 31.75"h] 14in diameter By simply measuring the width

By simply measuring the width or the length of the vent

color: #222

actual front end outer dimensions are approximately 16 5/8" width X 24 5/8" height

+ Product Details Perfect Fit & Easy Sizing - Designed for a 36" x 30" OR 30" x 36" duct opening (measured at the opening)

6"w X 30"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 7.75"w x 31.75"h] 14in diameter By simply measuring the width+ Product Details Size 6"w X 30"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 7. 75" Width X 31. 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