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The leading of waste air from a building is based on the following, exhaust air
classification
Class 1 Exhaust air which contains few impurities. The impurities are mainly from
people or structures. Air is suitable for return air and transfer air.
Class 2 Exhaust air which contains some impurities. The air is not used as return air of
other premises but can be lead for example to the toilet and washing room as
transfer air.
Class 3 Exhaust air from premises where high humidity, processes, chemicals and
smells essentially lower the quality of exhaust air. The air is not used as return
air or transfer air.
Class 4 Exhaust air which contains ill-smelling or unhealthy impurities considerably
more than the acceptable contents of the indoor air. The air is not used as
return air or transfer air.
Examples of exhaust air class of living areas
Class 1 Office rooms and small adjoining storage spaces, customer service and
teaching premises, meeting and business premises which are non-odorous.
Class 2 Living rooms, dining recesses, coffee kitchens, shops, warehouses of office
buildings, dressing rooms and restaurant premises where smoking is forbidden.
Class 3 Toilets, washing rooms, saunas, apartment kitchens, distribution and teaching
kitchens, copying premises of drawings.
Class 4 Professionally used fume cupboards, grilles and target exhaust air from
kitchens, car garages and driving tunnels, handling rooms of paints and solvent,
dirty wash laundries, store rooms of waste food, chemical laboratories, smoking
rooms, hotel and restaurant premises where smoking is permitted.
(Finland's building regulations D2 2003)
EXHAUST AIR CLASSIFICATION OF LIVING AREAS
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