The Helios FM 280 flexible sleeve is designed to minimize vibration transfer between fans and duct systems, improving noise control and system performance. It is intended for use with matching FR flanges (sold separately) that fit fan spigots. The connector is supplied in pairs and includes worm screw clamping bands for secure attachment. Suitable for a wide range of ventilation installations, this flexible sleeve is available in sizes from 100mm to 710mm, offering versatile compatibility.