heating, ventilating, and air-conditioning equipment and accessories, namely, fresh air blower, automatic furnace chimney vent dampers, evaporator coils, and blowers; air conditioner and heating apparatus consisting of low to medium static pressure hot-air and cold-air condenser/blower/compressor combination for the commercial market; fluid, air and water heaters, and chillers for domestic, commercial and industrial use, namely, thermal fluid heaters, make-up air heaters, air-cooled chillers, water-cooled chillers, compressor chillers, absorption liquid chillers for air conditioning purposes; air delivery and handling units in the nature of air conditioning units for cooling, heating and ventilating domestic, commercial and industrial buildings and for use in commercial process applications; air conditioning units consisting of air induction units, filters, humidifiers, ventilators, diffusers, blenders and convectors; condensing units for air conditioners; heating and heat exchanging, refrigerating, freezing and chilling apparatus for industrial and domestic use, namely, fan-coil units, fans and blowers; furnaces; air conditioners and heat pumps; heat exchangers not being parts of machines for use in heat transfer for industrial and commercial uses