Fortress is a precision engineered system of prefabricated PVC duct and fittings which conceals and protects exposed refrigeration line sets, electrical cable/telephone wiring and water or drain pipes. It comprises extruded PVC duct plus a full range of 16 injection molded Polypropylene fittings, all of which meet the requirements of the current UL -94V-0 specification and are suitable for temperatures from -4 to 140F . Conceals/protects exposed refrigeration linesets, electrical cable/telephone wires and water/drain pipes. All components except flexible split to provide easy installation for new and retrofit applications and easy disassembly for inspection or additions.Tapered sidesFlat bottomUV stableColor fast