Round Back Roof Vent for SM-Rib Panel | 4" Diameter | 4" Tall Collar | Metal Roof | 12 Sq. In. NFA

Round Back Roof Vent for SM-Rib Panel | Model RBV-4-C4-SM-Rib | 4-inch Diameter | 4-inch Collar The RBV-4-C4-SM-Rib is a premium 4-inch round-back static roof vent engineered specifically for metal roofs. This is done by featuring a 11” x 12” sub-base that is fabricated to the profile of the SM-Rib, Tuff Rib, Panel-Loc Plus, AG-Rib, and Master Rib exposed fastener metal roof designs. Having the roof vents base match the shape of the SM-Rib roof ensures a watertight, professional fit. High-Performance Ventilation Optimal Airflow: A 4-inch tall collar provides critical clearance between the roofline and the internal louvers, maximizing exhaust efficiency. Capacity: With 12 square inches of Net Free Area (NFA), a single vent effectively exhausts up to 50 square feet of attic space (based on the IBC 1/300 rule). Strategic Placement: Designed for roof pitches of 2/12 or greater. For maximum performance, you may install the roof vent down to 4 feet maximum from the ridge cap to capture and release the hottest air and moisture. Durability & Protection Weather-Ready Design: Spun from a single piece of heavy-duty, corrosion-resistant aluminum, the aerodynamic lid provides superior structural strength against high winds and harsh weather. Pest & Debris Shield: Precision-engineered internal louvers prevent rain and snow intrusion while keeping birds, insects, and wildlife out of your attic. Lifetime Build: All-aluminum construction ensures the unit will remain rust-free for the life of the roof. Energy Efficiency & Aesthetics Year-Round Comfort: By exhausting radiant heat in the summer and moisture-laden air in the winter, these vents help protect your roof structure and lower energy costs. Low-Profile Finish: The clean, round design blends effortlessly with metal panels. Choose from a variety of durable powder-coated colors that offer superior UV and weather resistance compared to standard wet paint. Need Assistance? To calculate the exact number of vents needed for your project, please use our [Vent Calculator]. For technical support or sizing questions: Email: sales@roofvents.com Phone: 845-565-7770 Visit: [FAQ Page] Note: For duct ventilation, please see our Round Back Roof Jack. For installations requiring a roof curb, view our Curb Mount Static Vents.