36"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 37.75"h] Compatible with Duct 8" Actual Filter Size – 29

Actual Filter Size – 29 3/4"w x 13 3/4" x 1"

+ Product Details Size – 34"w X 30"h is the size for the duct opening measurement only

+ Product Details Size – 8" x 20" or 20" x 8" is the size for the duct opening measurement only

Locking Security System – Features a built-in eight-tumbler lock and a supplied key to prevent tampering and maintain consistent temperature settings

+ Product Details Size - 32"w X 24"h is the size for the duct opening measurement only

36"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 37.75"h] Compatible with Duct 8" Actual Filter Size – 29+ Product Details Size 36"w X 36"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 37. 75" Width X 37. 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