Vacuum cleaners have filters in front of and behind the engine, too. Filters protect the device and purify the outgoing air.

By lower category products it is not the case. The manufacturers don't use filters with high filtration efficiency.

If you are allergic to dust or dust mites, it advisible to choose vacuums with the so-called HEPA ( High Efficiency Particulate Air) filter. HEPA filters are classified according to the filtration rate of 0,3 μm particle size. This amount is roughly equal to the cigarette smoke's particle size.

H10: The HEPA filter with the degree of 10 strains the 0,3 μm sized particles' 85%.
H11: The HEPA filter with the degree of 10 strains the 0,3 μm sized particles' 95%.
H12: The HEPA filter with the degree of 10 strains the 0,3 μm sized particles' 95,5 %.
H13: The HEPA filter with the degree of 10 strains the 0,3 μm sized particles' 95,95 %.
H14: The HEPA filter with the degree of 10 strains the 0,3 μm sized particles' 95,995 %.

Identical designed filters are replaceable with lower or higher capacity products. Only the outgoing air's quality changes with this modification, it does not affect the device's function.

These filters should be changed yearly, depending on the degree of wear and tear.

Motor filters by bagged vacuum cleaners should generally to be replaced after 4-5 pieces of used up dustbags. If it is not HEPA filter, then we speak about a rough touch material.

The micro filter on the output side has to be changed when it is visibly dirty. We should check its condition yearly.

Filters by devices without dustbag have to be replaced after 100 m² of cleaning. The filter at the tank should be changed every six month.

HEPA filters can be washed according to the manufacturer's feedback. But practical experiences show, we can extend the filter's lifetime with compressed air blowing only.