FAQ

Ventilation units - How is it with the filtration of supplied air?

"Fresh" outside air, depending on the ambient environment, contains various amounts of undesirable substances (dust, pollen, exhaust gases, biological odour, etc.), so when selecting the ventilation system, it is good to remember the real quality of the supplies outside air, and choose an adequate filtering. Other conditions are in buildings in the middle of the city, near a busy road or manufacturing premises, and others in a mountainous area near the forest.

Types of filters according to ČSN EN 779 for normal ventilation

Examples of separated substances

Coarse dust
G
x ≥ 10 μm

G1

leaves, insects, textile fibres, sand

fly ash, water drops, hair

G2

G3

flower pollen, blowing dust, mist

G4

medium-coarse dust, spores
M (F)

M(F)5

spores, cement dust (coarse fraction,
particles causing stains or deposits of dust

M(F)6

larger bacteria, spores on carrying aerosol particles,
PM 10 - dust

Fine dust
F

F7

bacteria, spores, accumulated soot, cement dust (fine fraction), i.e. “dust passing through the lungs”

Fine dust
G
x ≥ 1 μm

F8

bacteria, soot, oil mist, tobacco smoke (coarse fraction), metal oxide smoke (coarse fraction)

F9

Adsorption of gases
A
(activated charcoal)

A

light volatile hydrocarbons VOC (Volatile Organic Compounds), asphalt, gasoline, kerosine and tar vapours,
physical, civilisation, hospital, food, cooking and putrid odours

 

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