[ Ventilating ducts of metal, cable trunking systems comprised of metal trunking, metal pipes, metal conduits, metal gusset bends, metal tees, metal couplers, metal wire mesh cable trays, steel ladder racks and metal boxes ]

Ventilating ducts of metal, cable trunking systems comprised of metal trunking, metal pipes, metal conduits, metal gusset bends, metal tees, metal couplers, metal wire mesh cable trays, steel ladder racks and metal boxes