Vent Systems 16x6 inch galvanized metal vent covers are designed for standard HVAC duct openings up to 14.37 x 4.33 inches. Heavy-duty rust-resistant metal construction with UV-stabilized coating ensures durability indoors and outdoors. Built-in protective mesh screen blocks dust and particles while maintaining airflow. Angled louvered slats improve ventilation and help reduce wind, rain, and snow intrusion. Pre-drilled screw holes allow easy DIY installation. Screws not included.