by the shape of the heat exchangers or of parts thereof, e.g. of their fins

Full Title

Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station > Indoor units, e.g. fan coil units (self-contained units F24F1/02) > characterised by heat exchangers > by the shape of the heat exchangers or of parts thereof, e.g. of their fins