What is ventilation?
Ventilation is the intentional introduction of outdoor air into an indoor space.
Ventilation is mainly used to control indoor air quality by diluting and displacing indoor pollutants.
The main aim of ventilation is to control indoor temperature, humidity, thermal comfort, and various other parameters.
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Why and when to ventilate?
As we spend about 90% of our lives indoors, the indoor climate is extremely important for our well-being, therefore it can be clearly said that we ventilate for health and comfort of building occupants. Buildings — the same as humans — need to also breathe to make sure that fresh air comes in and dirty air goes out.
The building needs to provide a suitable environment for people and their activities: such as living, working, educating, playing, entertaining and physical activities. Ventilation is one of the systems that keeps our indoor environment habitable, keeping the air fresh and healthy indoors.
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How do we ventilate buildings?
Ventilation is air exchange from outdoor environment to indoors. The outdoor air has to go through the building envelope consisting of the various barriers separating — and also protecting — the building interior from the outdoor environment.
There are several ways that a building can be ventilated: infiltration or exfiltration through the building envelope is the unintentional way of air exchange or controlled airing can be done via building openings or various types of mechanical systems.
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