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3 FUNCTION DESCRIPTION
3.1 General information on indoor air quality
Fine dust, harmful gases and aerosol-borne pathogens in the air are bad for human health.
We spend more than 90% of our time indoors. The concentration of pollutants such as particulates,
ozone or volatile organic compounds (VOCs) can be five times higher than outdoors.
The quality of our ambient air takes on a special importance in times of virus outbreaks. Simply when
breathing out and speaking, every person distributes thousands of aerosols (tiny saliva particles) in the
ambient air. These particles are invisible to the human eye, under certain conditions they can fly farther
than 1.5 – 2.0 m, and they can even stay airborne for several hours. People with a virus infection spread
the disease in the air they breathe. If other people inhale infectious aerosols, the virus enter the lungs
through the respiratory tract and can lead to an infection. Reducing the concentration of aerosol-borne
pathogens indoors therefore plays an important role in reducing infection rates.
Virus can be transmitted on the air in spaces with an inadequate air exchange. For this reason, regular
ventilation is one of the most effective measures to reduce infection. Regularly exchanging indoor air
with fresh air reduces the concentrations of harmful gases (e.g. the carbon dioxide exhaled by humans)
and, where there are infected people, it reduces the concentration of virus-contaminated aerosols.
However, adequate ventilation is sometimes impossible where windows cannot be opened or are too
small. And all too often, people simply forget to ventilate. It is therefore advisable to support the
exchange of air with professional air filter systems.
This is where the OurAir TK 850 indoor air purifier can help you.
Function description
Function description
3.2 The purification process described
The MANN+HUMMEL OurAir TK 850 is a versatile air-purification system for indoor spaces. It is
equipped with a pre-filter element (ePM10 80%) and a HEPA main filter (H14). These combined filters
reliably capture more than 99.995% of all particles and aerosols in the room air (including particulates,
viruses, bacteria and other microorganisms). In models with integrated UV-C lamps, the HEPA filter
element is irradiated with UV-C rays at suitable intervals in order to neutralize pathogens such as bacte-
ria and viruses and to inhibit their growth.
The mobile OurAir TK 850 is intended for use in rooms of up to 70 m² with an air exchange rate of 5
times per hour. It is simply placed anywhere in the room. This also enables the effective use of a
number of appliances in rooms that exceed a nominal size of 70 m².
Fig. 2: Schematic illustration of the purification process
The schematic diagram illustrates the filtering process in your OurAir air purifier:
1. The fan (D) sucks in the contaminated ambient air (A) through the pre-filter element (B).
2. The pre-filter element (B) filters coarser, particulate impurities from the air. Optional is the additional
use of an activated carbon filter element for removal of unpleasant smells and harmful gases.
3. The fan (D) directs the pre-filtered air (C) past the UV-C lamps (E*) to the inlet side of the HEPA
filter (F), which filters all aerosol-borne substances from the air including pathogens such as bacteria
and viruses to at least 99.995%.
4. At regular time intervals, the UV-C lights (E*) reliably inactivate the pathogens deposited on the
HEPA filter (F).
5. After filtering, the purified air (G) flows out of the OurAir air purifier back into the room.
* Applies to models with integrated UV lamps
A
B
C
D
E*
F
G
