While optimising the airspeed through the whole filter saturation process, e-flow technology reduces energy consumption up to 30%*. At the same time sound levels are reduced up to 8 dB(A)**. *) Based on an independently verified power consumption test, conducted in laboratory environment, measuring current at nominal voltage with e-flow activated, without any restrictions in the system. Power is calculated from the current/voltage and compared with the power consumption at full flow, also without restrictions. **) Based on inhouse test conducted for models DE 110 and DE 120 in a laboratory environment, using the dust extractors without any restrictions in the system, measuring the noise level with and without e-flow activated.