Industrial and commercial heat transfer, heating, refrigeration, cooling and conditioning units namely; direct expansion coils; water cooling and heating coils; unit heaters; heating and ventilating units; fan-coil air conditioning units; central station air conditioners; condensing units; rooftop air conditioning units; heat pumps; water chillers; unit coo lers; vertical and horizontal evaporators and condensers for domestic use; ice making machines and refrigeration units for commercial and industrial use; coolers for air and gases; heat exchangers (not parts of machines) for heating and cooling fluids; intercoolers, aftercoolers; air heaters; radiators; radiator cores; oil coolers; fuel oil heating systems; feed water heaters; compressors (air) and parts and fittings for the abovementioned goods; and all other goods included in this class