The Helios FM 250 EX is a flexible sleeve specifically designed for use with explosion-proof fans. It acts as a vibration-dampening connector between the fan and duct system, effectively preventing structure-borne noise transmission and accommodating slight installation misalignments. Constructed from durable PVC fabric, the sleeve ensures safe and reliable operation in hazardous environments. Supplied with two hose clamps for fast and secure assembly, the FM 250 EX is an essential solution for safe, quiet, and efficient ventilation systems.