8"w X 10"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 11.75"h] Fixed Blades + Product Details Size –

+ Product Details Size – 18"w X 10"h is the size for the duct opening measurement only

this 4-way air vent diffuser allows you to precisely control airflow

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

Suitable for all AC applications

+ Product Details Size - 8"w X 34"h X 2"d (for duct opening measurement only)

8"w X 10"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 11.75"h] Fixed Blades + Product Details Size –+ Product Details Size 8"w X 10"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 9. 75" Width X 11. 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