# Semi-automatic filter cleaning (see figure I)

The filter cleaning function should be used regularly, and at the very latest when the suction power is no longer sufficient.

How often filter cleaning needs to be carried out will depend on the type and quantity of dust that has been extracted. With regular use, the maximum conveying capacity will be maintained for longer.

During semi-automatic filter cleaning (SFC+), the air flow is reversed to clean deposited dust from the flaps of the flat-pleated filter.

A pleated filter with surface dirt is still fully functional. It is not necessary to clean the flat-pleated filter manually by shaking or blowing it out; this may even damage the filter.

Note: Semi-automatic filter cleaning is activated at the factory (SFC+ switch (18) in position I).

- Actuating SFC+ filter cleaning
  Use the palm of your hand to close the opening in the nozzle or vacuum hose.
  Or, if the SFC+ module (20) is fitted:
  Push the actuator (33) down for approximately 10 seconds.
- Deactivating SFC+
  Push the SFC+ switch (18) forwards (position 0).
- Activating SFC+
  Push the SFC+ switch (18) backwards (position I).