tubes, tubing, ducts and ducting of metal or substantially of metal, with or without seals, with or without insulation, for use in ventilation, heating, air conditioning and exhaust systems as well as parts and fittings therefor in the nature of metal caps for tubing ends, metal junctions, metal elbows, metal reducers, metal tees, metal inlet pipes, cleanout access doors and covers, and metal pipe collars; metal hose fittings, metal pipes and metal pipe fittings therefor, namely, metal pipe d...

metal ventilation ducts, particulate matter extraction tubes and parts and fittings for the same; metal hose fittings; metal pipes and fittings; metal building materials; namely, metal fasteners; namely, screws, nails, and rivets