36"w X 30"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 31.75"h] Compatible With Duct 12in + Product Details Size -

+ Product Details Size - 18"w X 30"h is the size for the duct opening measurement only

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

A: Black Grilles Always Look Sharp And Never Show DIrt & Dust Marks

+ Product Details Size - 24"w X 22"h X 2"d (for duct opening measurement only)

The included eight-tumbler lock and supplied key provide secure access

36"w X 30"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 31.75"h] Compatible With Duct 12in + Product Details Size -+ Product Details Size 36"w X 30"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 37. 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