8"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 21.75"h] Ceiling Locking Security System – Features

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 – 26"w X 14"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 26 5/8" width X 34 5/8" height

actual front end outer dimensions are approximately 18 5/8" width X 32 5/8" height -

8"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 21.75"h] Ceiling Locking Security System – Features+ Product Details Size 8"w X 20"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 9. 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 wear