Tubular Flexible Tunnel Ventilation Ducting made of Plasticised PVC coating reinforced with a polyester textile that is flame retardant to EN 13501-1.Lightweight and extremely durable, it is used solely for tunnel ventilation during construction stage. Available in various tensile strength grades plus optional antistatic properties to suit various performance range, our ventilation ducting is compatible with all series and categories of tunnel ventilation fan. The ventilation ducting has a long history of over 70 years with a long list of worldwide supply project references.