FIG. 5.

Effect of humidity of inflow air on brain temperature. Ambient air at room temperature and a flow of 40 LPM was administered at 0% humidity and 100% humidity in sequence. Brain temperature decreased from 34.7°C to 33.8°C during exposure to dry air. The cooling effect was completely mitigated by humidifying the inflowing air at the same flow rate of 40 LPM (34.8°C to 34.9°C during 10-minute exposure to humid air). Cooling resumes once the dry air is turned back on in support of evaporation as the mechanism behind the cooling process.