Natural thermals

Body temperature affects the air!

People are warm, and we control our body temperature by emitting different amounts of heat. This happens 24 hours a day and is completely automatic, requiring no additional ventilation. The fact that we give off heat like this creates a natural airflow (natural convection) of 10–15 litres of air a second that tries to rise to the ceiling like a balloon.

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When we stand up, the airflow starts around our feet and follows the body upwards. Just like a chimney. The airflow changes in size and speed depending on how warm we are. This means that the airflow has a greater volume and speed when we have been training and are sweating, for instance, compared to times when we feel chilly.

Read moreWe remove more bacteria, particles and odours than conventional ventilation

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