[Excellent Airflow]: roof vents with backdraft damper still have an airflow of UP TO 75%, while other products on the market have an airflow of less than 50% and poor ventilation. [ Protection]: High-quality galvanized steel to durability and long-lasting use. The high-performance polyester powder coating has strong resistance and excellent protection. [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 8inch bathroom exhaust fan roof jack more firmly. [MULT-FUNCTIONAL]: roof vent for bath exhaust is constructed with high-quality material, is not only suitable for household roof ventilation systems but can also be installed in other ventilation systems on roofs, walls, and more. It is ideal for home areas such as kitchens, bathrooms, and attics, can be used with 8 inch duct and exhaust fans for house ventilation. Color: Black Material: 430 Stainless Steel Package Contents: 1 * Roof Vents 8 Inch Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.