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 actual front end outer dimensions

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

this model allows for mounting without removing the thermostat

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

Measuring 3" in diameter for the duct opening

Its generous size and universal design ensure a perfect fit for a wide range of thermostat models

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 actual front end outer dimensions+ 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