?Universal Fit for 4 Inch Vents? The hooded wall vent cover is designed for 4 Inch diameter exhaust ducts and is compatible with rigid metal pipes and flexible hoses. Suitable for wall-mounted installation. Please measure your duct size before purchasing to ensure proper fit. ?Backdraft Protection & Removable Mesh?This dryer vent cover features a damper that allows smooth exhaust airflow while blocking cold air backflow. The mesh can be easily removed with a power screwdriver, helping keep out birds, rodents, and insects while making cleaning simple ?Durable Metal Construction? The exterior dryer vent cover is made of high-quality galvanized steel with a rust-resistant and corrosion-proof coating. It is strong, weather-resistant, and built for long-term outdoor use, outperforming plastic vent covers. ?Easy Installation with Accessories? The package includes pre-drilled mounting holes, screws, and aluminum foil tape for secure sealing. It installs easily with standard tools—no complicated drilling required. ?Wide Application for Ventilation Systems? The exterior vent cover is suitable for dryers, bathroom fans, kitchen range hoods, garages, basements, AC vents, HVAC systems, sheds, offices, and RV ventilation. It provides reliable exhaust performance for multiple indoor and outdoor uses.