4 inch roof vent with backdraft damper allows an airflow of up to 75%. High-quality galvanized steel ensures durability and long-lasting use. The high-performance polyester powder coating provides strong resistance and excellent protection. The 4 inch roof vent comes with a 120mm x 90mm mesh cover with approximately 3mm grid spacing to effectively prevent the entry of small animals or birds. This roof dryer vent is designed for maximum airflow and protection, suitable for use with kitchen and roof exhaust venting systems, and can be used with 4 inch ducts and exhaust fans for house ventilation. The 4 inch vent includes a pipe extension located underneath the flange for connecting to flex ducting, and features four holes in the panel to assist in secure installation on a 4 inch bathroom exhaust fan roof jack. Color: Black Material: Steel Package Contents: 1 x Roof Vent Cap Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the actual item. Measurement may vary by +/- 1-3cm.