8"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - White [Outer Dimensions 9.75"w x 17.75"h] 2-Way Deflection 9% Pure Copper meeting ASTM

9% Pure Copper meeting ASTM B280 standards

+ Product Details Size – 16" x 16" is the size for the duct opening measurement only

the actual front end outer dimensions are 10" in diameter

ensuring your space stays dry and secure

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

8"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - White [Outer Dimensions 9.75"w x 17.75"h] 2-Way Deflection 9% Pure Copper meeting ASTM+ Product Details Size 8"w X 16"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 9. 75" Width X 17. 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