--- title: "Ventilation: how do buildings breathe?" description: Ventilation is an important factor of building health, and they need to be able to breathe to ensure fresh air comes in and dirty air escapes. image: https://blog.swegon.com/hubfs/Buildings_social.jpeg --- [![](https://www.swegon.com/Static/img/logo.svg?v=3)](https://www.swegon.com/uk/) Menu - [Solutions & services](https://www.swegon.com/uk/solutions-and-services/) - [Products>](https://www.swegon.com/uk/products/) - [References & Insights](https://www.swegon.com/uk/references-and-insights/) - [Support & Software](https://www.swegon.com/uk/support/) - [Sustainability](https://www.swegon.com/uk/sustainability/) - [Why Swegon?](https://www.swegon.com/uk/why-swegon/) - [Product Search](https://www.swegon.com/uk/product-search-result/) - [Document Search](https://www.swegon.com/uk/support/find-documents/) - [Careers](https://www.swegon.com/uk/careers/) - United Kingdom - [Contact](https://www.swegon.com/uk/contact/) ## Choose a market [Or visit our global site](https://www.swegon.com) - 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[Swegon Air Academy](https://blog.swegon.com/uk/author/swegon-air-academy) Jun 15, 2021 Like our lungs, buildings need to be able to breathe to ensure fresh air comes in and dirty air escapes. There is a need for air exchange from outside to inside, and also from inside to outside. This way, fresh outside air is able to enter the building. **Air exchange intended or not** For most buildings the air exchange takes place in the following three ways: 1. Unintentional: air leaks in through windows, doors and various openings such as joints and cracks in the building exterior. 2. Intended: through natural ventilation, by opening windows/doors and air vents intended for and by people. 3. With a mechanical ventilation system, to add an extra adjustable airflow in buildings for a good indoor climate. **We spend up to 90% of our time indoors** We humans have to breathe air to survive. Oxygen-rich air is initially found outside. However, people work and live in buildings. Some say we even spend 90% of our time indoors! Fresh air enters buildings as described above. It is recycled, used and polluted by various sources: 1. Due to human (and animal) activity - carbon dioxide (CO2), humidity or odours, etc... 2. By building materials, technological equipment, furniture, floor coverings (volatile organic carbon compounds that evaporate easily) 3. By outdoor pollutants from traffic and the earth: CO, radon from the ground, etc. The importance of a good ventilation system Indoor air quality is therefore a very important factor for the well-being and functioning of people. A good ventilation system contributes to a healthy indoor climate, where it is pleasant to live and/or work and guarantees good air quality. 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