The Helios MRV 355 is a heavy-duty mounting ring designed for the vertical installation of fans, particularly on shaft walls. Manufactured from galvanized sheet steel, it includes four mounting brackets suitable for direct attachment or for use with vibration dampers. Built to withstand high temperatures, this mounting ring is certified for smoke extraction systems rated F300 and F400. The MRV 355 ensures secure, stable fan mounting in safety-critical ventilation systems and demanding installation environments