Ventilation & indoor climate

Ventilation and indoor climate

More stringent building regulations mean that renovation projects
and new-builds are now very air-tight – so air-tight that they almost feel like being in a bag.

Buildings need to breathe
Buildings should be tight – but they should still be able to breathe. This sounds contradictory.
What we mean is that buildings should be tight so that we do not use too much energy on heating and that they should be able to breathe in order for humid and ‘used’ air to escape. Buildings should not breathe through random holes, but through controlled and on-demand ventilation.

High CO2 levels can damage your health
CO2 levels tell us whether sufficient amounts of fresh air are being injected considering the number of people in the room. If you are exposed to very high levels of CO2, it may damage your health, e.g.:
► Headache
► Dizziness
► Fatigue
► Restlessness
► Pins and needles in your legs
► Respiratory difficulties
► High blood

Our health is at stake
Not all buildings have a good indoor climate. This is often because the building contains too much humidity. This can cause both health-related and financial problems. For the building this can mean rot and mould in the structure which can give us asthma and allergies if they are allowed to develop. More and more people are diagnosed with asthma and allergies. Part of the explanation is a poor indoor climate.



high levels of CO2, high room temperature and high humidity = a poor indoor climate.

without mechanical ventilation we need to open doors and windows wide to create a draught two to three times a day for 5-10 minutes - to maintain a healthy indoor climate.

indoor air is full of chemicals and particles from e.g. furniture, floor covering, electronics and painted surfaces. Chemicals and particles flying around in the air and binding to the dust.




Excessively high humidity
Lack of ventilation increases the relative humidity in the rooms we use. Excessively high humidity allows dust mites to multiply and poses a risk of mould.

Dust mites
Dust mites measure 0.1-0.6 mm and cannot be seen with the naked eye. They thrive in high humidity, i.e. 55-75% RH (RH = relative humidity) and reproduce at a speed that is directly linked to room temperature and humidity. They absorb humidity through their skin – so if humidity is kept below 45% RH, they will dry out and die.

A typical result of lack of ventilation is that mould develops inside the building. Mould spores contain substances that are harmful to people and animals.

What should you do?
You should ventilate the room – but in the right way!
Decentralised ventilation with heat recovery ensures that nothing is left to chance. A decentralised ventilation unit that automatically adapts the flow of fresh air to each room provides an indoor climate that is both healthy and financially viable.

Indoor climate at work



Which unit to choose?

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