The Helios FM 450 flexible sleeve is designed to reduce vibration transmission between fans and duct systems, improving overall noise and mechanical stability. It is intended for use with compatible FR flanges (accessory) mounted on fan spigots. The connector is supplied in pairs and comes with worm screw clamping bands for a secure and easy installation. Available in sizes from 100 mm to 710 mm, this flexible sleeve provides effective vibration isolation in ventilation systems.