30"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 27.75"h] Ceiling + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 18" OR 18" x 30" duct opening (measured at the opening)

Operating from -40°F to +248°F

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

Actual Filter Size – 21 3/4"w x 23 3/4" x 1"

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30"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 27.75"h] Ceiling + Product Details Perfect Fit+ Product Details Size 30"w X 26"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 31. 75" Width X 27. 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