... Oil resistant Electrostatic grounding by spiral steel wire inside Detailed Product DescriptionPVC air duct, PVC air ... hose for HVAC and ventilation system with steel wire reinforced,flexible air hose. flexible air duct, ... pipeventilation hose, ventilation pipeFeature:Mterial: PVC with steel wire reinforcedExcellent flexibilityAnti-frictionOil resistantElectrostatic grounding by spiral steel ...