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© VALLOX • We reserve the right to make changes without prior notification.
Autumn
• Wash or change the coarse filter and clean
or change the fine filter if needed.
• Check that the heat recovery cell is clean.
• Check that the condensing water outlet is
not clogged.
Spring
• Wash or change the coarse filter and clean
or change the fine filter if needed.
• Clean the fan blades and the post-heating
unit if needed.
• Check that summer ventilation is in opera-
tion.
VALLOX 75/95
BASICS OF VENTILATION
THREE QUESTIONS ABOUT VENTILATION
Why is air replaced in dwellings?
Good ventilation promotes healthy living for both residents and the building
. Air in a dwelling needs to
be replaced in order to remove humidity brought about by living and impurities emanating
from structures and human bodies. Impurities of indoor air include carbon dioxide, formaldehyde,
radon and other gases as well as dust.
Mechanical ventilation is needed for adjusting air circulation as needed by the residents.
In a well sealed house, air does not circulate sufficiently by natural means. Even in a poorly
sealed house air is only replaced because of differences between indoor and outdoor air
temperatures, or because of winds. This means that ventilation is dependent on weather
conditions and cannot be regulated.
It is especially important that humidity and carbon dioxide content of the indoor air stay at
a healthy level. Recommended humidity content of good indoor air is approximately 45%.
Humidity content is lower in winter and higher in summer and autumn. Dust mites thrive in
indoor air if humidity exceeds 50%, and if humidity stays at over 60% for a long time in
winter, water condenses in the cold structures of the house and mould starts to form.
The recommended maximum carbon dioxide content in good indoor air is circa 1,000 ppm.
What are the characteristics of adequate ventilation?
• Indoor air stays fresh in all the rooms of the dwelling, also in bedrooms during night.
Without adequate ventilation
, carbon dioxide content tends to rise high especially in bedrooms.
• The bathroom and the sauna get dry quickly.
• During the heating season, the windows and other outer wall structures remain dry.
• Humidity in indoor air is not condensed in the ventilation ducts.
• Air is fresh in the toilet as well.
How much air is replaced?
For air to be clean to breathe, it has to be replaced with outdoor air
every two hours
. In a
new and a renovated house, air circulation needs to be boosted during the first year in order
to remove harmful gases and structural humidity. In buildings that are more than a year old
and dry, ventilation can be regulated as needed. Ventilation is boosted during for instance
a sauna bath, clothes washing and cooking, and reduced during very cold periods or when
there is nobody at home.
Window ventilation
Dwelling-specific supply / extract air circulation does by no means prevent you from opening
windows and the door to the balcony or airing through them.
In window or door ventilation attention needs to be paid to the following factors:
During the heating season window ventilation consumes, uncontrollably, a considerable
amount of energy.
An open window lets in dusty and dirty air.
An open window also lets in noise pollution.
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SEASONAL CALENDAR
NOTE!
For further details, see inner
pages.
Summary of Contents for 75
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