30"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 17.75"h] Compatible With Duct 12in 75"H – fits a 18"

75"H – fits a 18" X 4" duct opening

Filter Size - 13

actual front end outer dimensions are approximately 16 5/8" width X 38 5/8" height

these pipes offer easy handling

+ Product Details Size - 16"w X 18"h is the size for the duct opening measurement only

30"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 17.75"h] Compatible With Duct 12in 75"H – fits a 18"+ Product Details Size 30"w X 16"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 31. 75" Width X 17. 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