30"w X 10"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 11.75"h] with filter + Product Details Size -

+ Product Details Size - 14"w X 18"h is the size for the duct opening measurement only

These are specially sized to fit into all drop ceilings

These are built heavy duty for installation into brick and cement walls

actual front end outer dimensions are approximately 36 5/8" width X 36 5/8" height

+ Product Details Size – 16"w X 25"h is the size for the duct opening measurement only

30"w X 10"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 11.75"h] with filter + Product Details Size -+ Product Details Size 30"w X 10"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 31. 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