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 8in + Product Details Size -

+ Product Details Size - 40"w X 6"h is the size for the duct opening measurement only

actual front end outer dimensions are 19

Its elegant look and fine finish and the natural warmth of oak wood

actual front end outer dimensions are approximately 24 5/8" width X 8 5/8" height

Design – removable frame for easy filter change & cleaning - uses a 1" thick filter

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 8in + Product Details Size -+ 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