Side channel vacuum generators generate low-pulsation suction and blowing air through their internal "multi-stage" compression. The optimal impeller design with curved impeller blades guarantees optimal efficiency. The separation of the compression chambers on both sides of the impeller enables combined suction and pressure operation with just one impeller. Suction filter, vacuum and pressure safety valve are optionally integrated in the patented design of the silencer. The silencers can be varied in length for flexible adaptation to the installation space available.