A refrigeration compressor for vehicles provided with a discharging port formed at a cap portion thereof for discharging compressed refrigerant and with a suction port formed in a crank shaft room for leading the refrigerant thereinto. The cap portion is provided with several component passages for discharging refrigerant having different size spaces and different directions so that the cap functions as a muffler.
A side channel blower, especially for use as a combustion air blower in vehicle heaters, with a blower housing comprising at least one side channel, into which one intake opening and one exhaust opening terminate, as well as with a blower wheel disposed in the immediate vicinity of the side channel and provided with a plurality of blades. In order to reduce the noise emission of the blower, at least that edge of the intake opening, which lies to the rear in the rotational direction of the blower wheel, is made elastic.
