Acetylene burners; Air conditioning apparatus and installations; Gas regulators; Heating systems for residential and commercial buildings comprised of biomass burners, boilers, valves, pipes, manifolds, solar panels, control panels, switches and electrical wire, all sold as a unit; Plumbing fittings, namely, valves; Refrigerators and freezers for household use and replacement parts and fittings therefor; Safety accessories for gas pipes, namely, flashback arrestors and reverse flow check valv...