28"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 29.75"w x 13.75"h] with filter Actual Filter Size – 29

Actual Filter Size – 29 3/4"w x 23 3/4" x 1"

+ Product Details Size - 8"w X 32"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 36" OR 36" x 18" duct opening (measured at the opening)

Filter Size - 27

+ Product Details Heavy-Duty Steel Construction - Made from 20-gauge steel for superior strength and durability

28"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 29.75"w x 13.75"h] with filter Actual Filter Size – 29+ Product Details Size 28"w X 12"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 29. 75" Width X 13. 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