The faint odors were perceived right before and during the evaporator operation but their odor intensity and unpleasantness were insignificant. However, sour, vinegar-like odor was perceived for 20 min after turning off the evaporator. Relative humidity at the outlet of the evaporator was gradually decreased from 100% when the strong odors were perceived. The relative humidity was rapidly decreased 23min after turning off the evaporator and the odor intensity was further stronger. Odor sampling was performed at this point of time for three times. The odors became faint 30 min after stopping the evaporator. This similar tendency occurred five times for the replicated odor reproduction experiments. All of the panelists perceived strong odors when the relative humidity at the outlet of the evaporator was gradually or rapidly decreased from 100% relative humidity. This odor production tendency was the same as the result of the previous study [3]. However, those tendencies greatly depended on both the controlled air conditions (e.g. temperature, relative humidity) and air flow rate from the blower (e.g. levels 1–6). Table 2 shows the evaporator operation time and change of odor continuation time, and odor intensity. 100% relative humidity continuation time and odor continuation time and odor intensity were changed depending on the evaporator operation time. Furthermore, it was found that when the evaporator operation time is longer, the odor continuation time becomes longer but the odor intensity becomes weaker. On the contrary, when the evaporator operation time is shorter, the odor continuation time becomes shorter but the odor intensity becomes stronger (more detailed results are described in Section 3.4). Therefore, when sample collection is carried out for the odor emitted from the evaporator, short evaporator operation time is strongly recommended to get better results. Otherwise, it would be very challengeable to collect and identify the odor from the evaporator.