6"w X 28"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 7.75"w x 29.75"h] 10" Round Duct Pipe + Product Details Size –

+ Product Details Size – 25"w X 14"h is the size for the duct opening measurement only

simply pop the diffuser into the wall duct hole and let the side springs hold it securely in place

actual front end outer dimensions are approximately 32 5/8" width X 30 5/8" height

Measuring 3" in diameter for the duct opening

actual front end outer dimensions are approximately 36 5/8" width X 8 5/8" height

6"w X 28"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 7.75"w x 29.75"h] 10" Round Duct Pipe + Product Details Size –+ Product Details Size 6"w X 28"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 7. 75" Width X 29. 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 wear