22"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 23.75"w x 17.75"h] Adjustable Return + Product Details Size -

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

+ Product Details Size - 12"w X 6"h is the size for the duct opening measurement only

These are airflow control components made to connect to supply grilles of the drop ceiling

+ Product Details Size – 12"w X 22"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 24" x 36" OR 36" x 24" duct opening (measured at the opening)

22"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 23.75"w x 17.75"h] Adjustable Return + Product Details Size -+ Product Details Size 22"w X 16"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 23. 75" Width X 17. 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