8"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 37.75"h] w26h26 + Product Details Size -

+ Product Details Size - 8"w X 24"h is the size for the duct opening measurement only

Design – Individually adjusting curved blades

875" width X 22" height

+ Product Details Size – 24" x 24" with 8" collar T-Bar drop ceiling perforated return grill - metal back casing

+ Product Details Size – 12"w X 24"h is the size for the duct opening measurement only

8"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 37.75"h] w26h26 + Product Details Size -+ Product Details Size 8"w X 36"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 9. 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 wear