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,...