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Ventilation of a house

Proper ventilation of a home is important for your health. By refreshing the air carbon dioxide, moisture and pollution (smoke, dust, odors) are discharged. If a house is badly ventilated, this increase the risk of:

Polluted air at home increases allergies, respiratory problems and irritations of mucous membranes.

In the past houses were ventilated uncontrolled by the wind that blew through crash and crevices. That doesn’t happen anymore in modern well-insulated houses, so they must be ventilated through natural (passive) ventilation or mechanical (active) ventilation.

CO2 and humidity are indicators of the atmosphere inside and simple meters are available. A CO2 meter ranges in price from 125 to 300 euros, a hygrometer (for humidity) costs approximately 10 euros.

How much should you ventilate?

A rule of thumb is that under normal circumstances you should refresh 7.5 litres of air per second per person present in the living room. Regarding the kitchen this figure is 50 litres per second and regarding the garage it’s 50 litres per second per old car present (toxic gasoline vapours). A vent perpendicular to the wind direction gives the best result. The wind direction may be variable, but the direction of the ventilation grid with respect to adjacent buildings isn’t. Nowadays there are also self-regulating vents on the market.


  • Don’t smoke inside
  • Ventilate more during cooking or showering
  • Ventilate more if there are many people in the house
  • Ensure proper ventilation of damp rooms, such as kitchen, utility room or shower
  • Regular airing