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] RV Mobile Home Actual Filter Size – 31

Actual Filter Size – 31 3/4"w x 5 3/4" x 1"

Measuring 5" in diameter for the duct opening

+ Product Details Size – 28"w X 20"h is the size for the duct opening measurement only

providing superior air distribution throughout your space

+ Product Details Size - 18"w X 20"h X 2"d (for duct opening measurement only)

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] RV Mobile Home Actual Filter Size – 31+ 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