Wall Vent Cap is designed for use with a 6" round duct, providing an efficient solution for your ventilation needs. This vent cap features a built-in spring-loaded backdraft damper and a bird screen to prevent outside weather and pests from entering your home. Crafted from durable .025 aluminum with a natural mill finish, it combines functionality with long-lasting quality. The Wall Vent Cap ensures your ventilation system operates smoothly while maintaining protection from external elements. Model Number: 641