18"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Black [Outer Dimensions 19.75"w x 25.75"h] 6" Round Duct Pipe + Product Description Introducing the

+ Product Description Introducing the 6" Butterfly Damper – Your Solution for Controlled Airflow

+ Product Details Size - 6"w X 36"h X 2"d (for duct opening measurement only)

Adjustable airflow control – Adjustable airflow control: The system allows users to customize the amount of air supply

actual front end outer dimensions are approximately 22 5/8" width X 36 5/8" height

5" Wide x 12" Tall x 2

18"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Black [Outer Dimensions 19.75"w x 25.75"h] 6" Round Duct Pipe + Product Description Introducing the+ Product Details Size 18"w X 24"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 19. 75" Width X 25. 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