The two KETOS models are bursting with strength. These are extremely powerful, modern and commercial professional vacuum cleaners of top class and thus are made for heavy daily use of contractors, industry, maintenance service and food service. The in series connected high performance motors attain a suction power of 300 mbar at a volume flow of 70 litres/sec. per motor. They create a kind of turbo charging effect, which triggers the machine’s intense power spectrum at a sound pressure level of only 69 LpA [dB] while operating at full capacity.