Compressors, compressor units and blowers for gas compression or air supply, including reciprocating and screw refrigeration compressors, vehicle air-conditioning compressors, LPG compressors and ring-channel blowers, together with dedicated components and upgrade sets. Refrigerant, pressure class, displacement, drive and installation conditions qualify the selected family. Excludes complete heating or refrigeration plants, ventilation installations and separately supplied vacuum pumps or priming ejectors.