30"w X 14"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 15.75"h] with filter Actual Filter Size – 31

Actual Filter Size – 31 3/4"w x 13 3/4" x 1"

This versatile diffuser is available in 1-way

+ Product Details Size – 18" x 36" or 36" x 18" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 28 5/8" width X 10 5/8" height

30"w X 14"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 15.75"h] with filter Actual Filter Size – 31+ Product Details Size 30"w X 14"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 31. 75" Width X 15. 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