The Helios MRV 400 is a durable mounting ring designed for vertical installation of fans, such as on shaft walls. Made from galvanized sheet steel, it includes four mounting brackets for direct fan mounting or the option to install vibration dampers. This mounting ring is rated for use in smoke extraction applications with temperature resistance classifications of F300 and F400, ensuring reliable performance in fire safety ventilation systems. The MRV 400 provides a secure and heat-resistant solution for vertical fan mounting in industrial and commercial settings.