Controlled residential ventilation continuously supplies living spaces with fresh air. The filters – outside air filters and extract air filters – play an important role here.
The outside air filter ensures that the supply air in the house is clean and fresh. Fine dust and pollen, but also spores, viruses, and bacteria from the outside cannot get into the building this way. In addition to that, outside air filters protect installed components from getting dirty.
Through the extract air filter, the used air is returned to the outside Dust and dirt particles are also filtered out of the extract air and prevent the unit from becoming dirty. This ensures clean operation of the heat exchanger and the efficiency of the heat recovery is maintained (as an option, there is the possibility of inserting filters directly in the extraction openings, which are also intended to protect the pipe system from getting dirty).
In December 2016, ISO 16890 came into force to concretise filter evaluation and filter classification. It has now been valid since mid-2018. The standard describes the air filters for general ventilation and air conditioning and divides the filters into four filter class groups. They are now also adapted to the fine dust classes applied by the WHO (World Health Organisation). ISO 16890 is replacing known filter classes such as G4 or F7.
Many studies deal with the effects of particulate matter on human health. The results are clear: air pollution is highly harmful to health. A WHO study confirms that inhalation can lead to lung or cardiovascular disease with early death. The study's findings also prove that not only coarse dust (PM 10), which has already been recognised as problematic for health, is responsible for health problems and shortened life expectancy, but that fine dust is even worse.
Sand, fluff, flying seeds, fine hairs
They can get into your nose and mouth.
Pollen, rock dust, dust from field cultivation
They get into the upper respiratory tract.
Bacteria, fungal and mould spores, pollen, toner dust
They get into the lower respiratory tract.
Viruses, bacteria, nanoparticles, soot from fossil fuels, sea salt, oil mist
They get to alveoli and into the bloodstream.
(Explanation e.g. ISO ePM 2.5 60 % (particles ≤ 2.5 μm): ePM 2.5 designates the particle size for particles ≤ 2.5 μm. 60 % describes that particles with a size of up to 2.5 μm are filtered with a proportion of 60 %.)
Kermi only install external filters according to ISO 16890 – ePM 1 in all central ventilation units.
The filters need to be replaced at regular intervals. This ensures:
For normal filters, a change interval of 60 to 180 days is common. The extract air filter is often more polluted than the outside air filter, because living indoors produces house dust that is found in the extract air filter.
Maintenance by the user is limited to regular filter changes.
If the symbol for changing the filters appears on the display, they should be replaced with new original filters. The unit must be used without filters.
Note on maintenance by a specialist:
Every two years, your x-well residential ventilation system should be serviced by a specialist who will thoroughly check it.
No tools are required to change the filters on any of the units!
The filters need to be changed at the latest when the symbol is shown on the display. The change is carried out in just a few steps and is completely uncomplicated.
The filters (marked green) are located behind the filter flap and the EPDM closures.
1. Switch the unit off! Only change the filter when it is de-energized!
2. Open the filter flap and remove the dark foam (EPDM closures).
3. Remove the outside air filter F7 and the extract air filter F5. Pay attention to the direction on the arrow! The arrows on the filter and on the filter shaft show the flow direction.
4. Insert new original filter in arrow direction (air flow direction).
5. Insert EPDM closures in reverse direction again and close the filter flap.
6. Switch the unit on again and acknowledge filter maintenance on the display.
The filters (marked green) are located behind the filter flap and the EPDM closures.
1. Switch the unit off! Only change the filter when it is de-energized.
2. On x-well F170, remove the covers and the EPDM closures (dark foam). On x-well F130, remove the covers.
3. Remove the outside air filter F7 and the extract air filter M5. Pay attention to the direction on the arrow!
4. Insert the new original filters. The arrows on the filter and on the filter shaft show the flow direction!
5. In reverse sequence
6. Switch the unit on again. Press the control element menu button (M). Select filter symbol with the touchpad and confirm filter change.
Check the dust filter every six months and the pollen filter every three months (marked green). Here, too, the change can be made in just a few steps. The filters are located behind the inner panel.
1. Disconnect the fan from the power supply! Only change the filter when it is de-energized.
2. Pull the internal panel of the fan out of the installation pipe.
3. This is how to clean dust or pollen filters
|
Component |
Interval |
Measure |
| Dust filter | Every six months | Use vacuum cleaner to clean the dust filter. Wash dust filter with warm water Replace a heavily soiled, defective dust filter |
| Pollen filter | Every three months | Use vacuum cleaner to clean the pollen filter. Replace a heavily soiled, defective pollen filter |
