A flame-retardant flexible duct suitable for the extraction of gaseous products, welding fumes and general ventilation applications. The FRF is manufactured from a flame retardant PVC coated polyester fabric with a spring steel helix that is extremely flexible and has good compressibilty. Operating temperature range -30°C to +100°C. Applications include welding fumes, kitchen exhaust ventilation and extraction of light weight dusts. This listing is for 152mm diameter FRF.