Today there is an increasing focus on the importance of a proper ventilation system to obtain good working conditions in the term of air and thermal quality to ensure high productivity. Different ventilation principles are used e.g. mixing ventilation and displacement ventilation. In order to ensure that the ventilation system meets the demands it is important to know which parameters that influence the performance of the system. In this work the mixing ventilation principle was investigated. When the mixing ventilation principle is used for the design of a ventilation system it is assumed that the air is fully mixed. The objective of this work is to determine the influence of the location of a pollutant, temperature differences and whether the room is furnished or not. It is also investigated if it is sufficient to determine the mean concentration in the room to determine the personal exposure. Full-scale experiments along with a breathing thermal manikin (BTM) have been used. The results show that the location of the source is of great importance, just as well as temperature differences. Furthermore, the concentration in the breathing zone showed large differences throughout the room.
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