•PVCAFS-HEAVY non-insulated industrial reinforced PVC flexible air ducts are specifically produced for low and medium pressure heating, cooling, ventilation, air conditioning, exhaust and dust extraction systems. •PVCAFS-HEAVY is highly resilient and can be used in applications with excessive vibration and/or perpetual motion systems. •Non-insulated industrial PVCAFS-HEAVY flexible air ducts are airtight. •PVCAFS-HEAVY is manufactured from hardwearing PVC canvas strip reinforced with high tension steel spring wire. •PVCAFS-HEAVY is highly elastic and flexible. It can be easily fitted to circular, oval or rectangular connectors.