Non-metal air-conditioning ducts; Air-conditioning ducts, not of metal; Non-metallic drainage pipes; Sewer pipes, not of metal; Plastic water conduits for roofs; Water-pipes, not of metal; Plastic water conduits for balconies; Water-pipe valves, not of metal or plastic; Non-metal sewer pipes; Non-metal air conditioning ducts; Plastic conduit for drainage; Non-metal vent cover for HVAC ducts; Non-metal HVAC ducts; Millwork, exclusive of cabinets; Ducts, not of metal, for ventilating and air-co...