6"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 7.75"w x 21.75"h] sidewall Perfectly suited for both residential

Perfectly suited for both residential and commercial use

+ Product Details Size – 12" x 18" or 18" x 12" is the size for the duct opening measurement only

actual front end outer dimensions are 19" Width X 19" Height

+ Product Details Size – 12"w X 28"h is the size for the duct opening measurement only

75" width X 25

6"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 7.75"w x 21.75"h] sidewall Perfectly suited for both residential+ Product Details Size 6"w X 20"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 7. 75" Width X 21. 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