XICHENG EP LTD manufactures PP (polypropylene) air ducts and ventilation fittings for industrial corrosive air handling, fume extraction and laboratory exhaust systems. Choose from round and rectangular PP ducts, elbows, reducers, couplings, flanges, dampers and valves — every component is ISO 9001 certified and made to order in custom sizes.
Polypropylene Round Ducts
Round PP ducting from φ20–600 mm with a smooth bore for low-friction handling of corrosive air and fumes.
Polypropylene Rectangular Ducts
Space-saving rectangular PP ducts, custom sized to fit your ductwork layout and installation space.
Custom PP Round Duct
Custom-diameter round PP ducts built to your project spec, with flanged or bell-and-spigot ends.
PP 90° Elbow
90° PP elbow for turning round ductwork with minimal pressure drop.
PP 45° Elbow
45° PP elbow for gentle direction changes in long ventilation runs.
PP Air Duct Tee
PP tee fitting for splitting or merging duct branches in corrosive-air systems.
PP Concentric Reducer
Concentric PP reducer for stepping between duct diameters in a run.
PP Air Duct Coupling
PP coupling to join two duct sections with a tight, leak-free fit.
PP Air Duct Flange
PP flange for rigid, bolted connections between duct sections and equipment.
PP Square Duct 90° Elbow
90° square elbow for turning rectangular PP duct runs.
PP Back Draft Damper
PP back draft damper that stops reverse airflow in exhaust stacks and ducting.
PP Duct Rain Cap
PP rain cap that protects vertical duct terminations from weather ingress.
Manual Air Damper Valve
Manual PP damper valve for balancing air flow by hand.
Electric Air Damper Valve
Motorized PP electric damper valve for automated airflow control in HVAC systems.
