refrigerant compresors and parts therefor

electrostatic air filters; refrigeration units; fluid, air and water heaters, and chillers for domestic, commercial and industrial use; air delivery and handling units for cooling, heating and ventilating domestic, commercial and industrial buildings and for use in commercial process applications; air induction units, filters, humidifiers, ventilators, diffusers, blenders and convectors; terminal air units; variable air volume units; refrigerant condensers, evaporators and absorbers; condensing units; fan-coil units; fans and blowers; furnaces; air conditioners and heat pumps; heat exchangers for use in heat transfer for industrial and commercial uses; and, parts therefor