[Corrosion Protection]: High-quality galvanized steel to ensure durability and long-lasting use. The high-performance polyester powder coating has strong corrosion resistance and excellent corrosion protection. [Excellent Design]: Hon&Guan roof vent cap with backdraft damper can help prevent wind, rain, snow and external damage from entering while effectively ventilating. It can be connected to any 8-inch hose. [Easy Installation]: 8 inch vent includes a pipe extension located underneath the flange for connecting to flex ducting, and there are four holes in the panel, which can help you install on the 8” bathroom exhaust fan roof jack more firmly. [Widely Use]: Hon&Guan roof dryer vent is designed for maximum airflow and protection, to be used with kitchen and roof exhaust venting systems, can be used in conjunction with 8 inch duct and exhaust fans for house ventilation. [Buy with Confidence]: We promise to ensure your absolute satisfaction with every purchase. Risk-free shopping.