The Helios FM 630 flexible sleeve is engineered to minimize vibration transmission between fans and ducting systems. It is designed to be used alongside matching FR flanges (sold separately) that fit onto fan spigots. This flexible connector is supplied in pairs and comes with durable worm screw clamping bands for secure and easy installation. Suitable for a range of duct sizes from 100mm up to 710mm, it ensures reliable vibration isolation and smooth operation in ventilation setups.