Regular visual inspection (at least once a year) of the external grille for dirt, damage and corrosion. If necessary, clean if visible soiling is recognisable. Clean the external grille with a mild surfactant. An alcohol-based agent is recommended for possible disinfection.
Cleaning the wall feed-through: By pulling off the valve cap and removing the filter, the wall feed-through can be seen when the valve is open. The wall feed-through can be inspected and cleaned with a cloth or hoover if necessary.
G2 air filter (filter foam): In case of light soiling, wash out with clear water. Replace the G2 air filter if it is very dirty.
In general replace G3 air filter (fleece material) with a new G3 air filter.Do not wash out the filter.
For hygienic reasons, replace the air filter annually. Depending on the system design, use air filters of filter class G2 or G3.
Window valves: The filter should be removed at least twice a year and cleaned with lukewarm soapy water. After cleaning, reinsert the filter. The filter must be replaced if it is very dirty.