26 / 68
9.6 Filtering particles
suspended in the air
The air conditioning system is exposed to large
quantities of exhaust gases, soot, dust particles,
pollen and allergens.
Pollutants and particles must be trapped before air
enters the cabin.
> 10 µm
- Heavy dust / Sand
- Pollen
- Dust
- Diesel particles
- Ashes
- Bacterias
- Smoke / Smog / Soot
- Allergens
- Gaseous contaminants
< 1 µm > 10 µm - 1 µm
The largest particles (leaves, insects, etc.) are
captured by the air inlet grille, which has a mesh
measuring a few millimeters and acts as a preliminary
filter.
The smaller the particle size the higher the risk for
the occupants, particles smaller than 2.5µm are the
most dangerous.
A cabin filter is built into the air conditioning system
to trap those particles.
The cabin air filter functions :
1. Car occupant’s protection
g
Cleans the air from particles, gas, allergens,
pollution
2. A/C system optimum functionality
g
Prevents from contamination
of the heating and A/C system
g
Ensures maximum performances
to the system
g
Prevents the soiling of the windows
for a better visibility
harmful particles (pollen, dust,
spores, ashes, bacteria, soot,...)
harmful gases (ozone, nitrogen
dioxide, toluene, butane, sulfur
dioxide,...)
unpleasant odours
entrance of the inhalation allergen
into the cabin (allergen neutralization)
9. The Heating
Ventilation and
Air Conditioning
unit (HVAC)
24
PROTECTS AGAINST