The Helios FM 225 flexible sleeve is used to reduce vibration transfer between fans and ventilation ductwork, ensuring quieter and more stable operation. Designed to be used with corresponding FR flanges on fan spigots, this connector absorbs mechanical oscillations while maintaining a secure fit. It comes in pairs, complete with worm screw clamping bands, and is available in sizes ranging from 100 mm to 710 mm for versatile system integration.