SUMMARY
The determination of turbulence intensity and air velocity distribution in the ventilated spaces are very important from the point of view of draught comfort. In most cases, in slot ventilated spaces tangential air distribution system is applied. There are several references investigating draught comfort in ventilated spaces. However, most of these studies do not consider the exact type of the air distribution system. Another relevant question is that average 40 [%] turbulence intensity given in standard EN 13779 for designing how depends on the tangential air distribution. In this paper the turbulence intensity and air velocity distribution were investigated by experimentally in case of applying tangential air distribution system. Results showed that turbulence intensity and air velocity distribution depends on the air distribution system. Furthermore, average 40 [%] turbulence intensity given in the standard is not always relevant.