30"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 21.75"h] 6" Diameter + Product Details Size –

+ Product Details Size – 22"w X 25"h is the size for the duct opening measurement only

+ Product Details Size – 14" x 16" or 16" x 14" is the size for the duct opening measurement only

Actual Filter Size – 33 3/4"w x 19 3/4" x 1"

ceiling height)

it effectively prevents unauthorized access

30"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 21.75"h] 6" Diameter + Product Details Size –+ Product Details Size 30"w X 20"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 31. 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