14"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 15.75"w x 37.75"h] 18" Round Duct Pipe + Product Details Size -

+ Product Details Size - 4"w X 22"h is the size for the duct opening measurement only

4" X 10" Is The Size For The Duct Opening (floor/vent hole) Measurement Only

+ Product Details Size - 8"w X 30"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 24" x 34" OR 34" x 24" duct opening (measured at the opening)

Mounted with frame and bayonet joint which are included

14"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 15.75"w x 37.75"h] 18" Round Duct Pipe + Product Details Size -+ Product Details Size 14"w X 36"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 15. 75" Width X 37. 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