Dantherm HCH 5 Guide D'utilisation page 10

Functional description,
Filters The purpose with the filters is to remove dust and other impurities from the outside air
before it is supplied into the house, and to protect both the heat exchanger and the
fans from any dirt and impurities coming from the house.
As a standard the unit is delivered with G4 filters on both the supply air and the extract
air sides. It is possible to buy F7-pollen filters (accessories) for the supply air, which
strains even more, especially suited for people with pollen allergy.
The filters must be changed at regular intervals, more information regarding change of
filters in the section "Preventive maintenance", on page 14.
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continued