Temperature Variations in Disposable Heat and Moisture Exchangers

Abstract
Temperature variations in different parts of 3 heat and moisture exchangers (HME) were measured during spontaneous [human] breathing. Temperatures below ambient occurred in the distal part of 2 of them. Lowest temperatures were more than 6.degree. C below room temperature. This effect can explain why gas expired through a good HME is not saturated with water at ambient temperature.