[FIGURE 4 OMITTED]

The influence of the room air temperature on the CFE was analyzed. The average of the CFE index obtained with the four fans at the tested velocities was calculated for each of the room air temperatures. The results are compared in Figure 5. From a heat-transfer point of view, the room air temperature has an influence on the cooling effect and, thus, should have an influence on the CFE index. A paired sample t-test was used to identify whether the difference in the mean between each temperature level is significant. A paired test hypothesis is valid, because the same sample has been tested at different temperature levels. The results of the t-test are plotted in Figure 5. Significant differences in the average were found between all tested averaged CFEs. The results reported in Table C1 (see Appendix C) reveal that the room air temperature has no effect on the power consumption of the fan.