DVERSATILITY: With overall dimensions of 12-3/4" wide x 5-5/8" high, and a duct fitting that protrudes 4-7/8" from the back of the cap, this wall cap is designed for a proper fit with ductwork (not suitable for dryer venting) DURABLE AND STRONG:Crafted from 24-gauge CRCQ steel, this wall cap features a black electrically-bonded epoxy finish, ensuring exceptional durability and resistance to corrosion for long-lasting performance EFFICIENT VENTILATION : The vent flapper is designed for microwave and range exhaust fans, sealing tightly and operating smoothly at low settings while fully opening at high settings to maximize airflow EASY MAINTENANCE : The sturdy screen is easily removable, allowing for hassle-free cleaning and maintenance SMART BACKDRAFT PROTECTION: The spring loaded damper with gasket ensures a tight seal that prevents outside air or critters from coming inside the home Replacement Number:639 High quality: durable, long life Features: Equipped with spring-loaded return air dampers and bird screens to keep nests and small animals outside Service: If you have any questions, please ask us for help