�COMBIAFS aluminium & PVC combined flexible air ducts are specifically produced for discharging welding fumes and dense chemical gases where high mechanical resistance is required. COMBIAFS is also recommended for heating, cooling and air conditioning systems. �COMBIAFS is produced from multi-layer aluminium & polyester strengthened with high tension steel spring wire, covered with a PVC jacket. �An important aspect of COMBIAFS is its non-condensing property. �COMBIAFS is elastic and flexible. It can be easily fitted to circular, oval, or rectangular connectors.