The Helios FM 710 flexible sleeve is engineered to minimize vibration transmission between fans and ducting systems. Designed for use with matching FR flanges (sold separately) fitted on fan spigots, this flexible connector ensures quieter operation and protects ductwork from vibrations. Supplied in pairs, it includes worm screw clamping bands for a secure and reliable installation. Suitable for ventilation systems requiring effective vibration isolation, the FM 710 is available in sizes ranging from 100 mm to 710 mm.