An Inexpensive Humidifying and Cooling System for Inhalation Chambers

Abstract A relatively inexpensive method for humidifying and cooling the intake air supply of an animal inhalation chamber is described. Specifically, incorporation of a humidifier into the air intake supply and circulation of cold water around the aerosol intake line is required. Descriptive statistics of 3 sets of relative humidity and temperature data from combustion trials of a military smoke product showed that: (1) mean within-chamber relative humidities were increased approximately 2.5 times over ambient conditions, (2) mean within-chamber temperatures were reduced approximately 10°C, and (3) mean within-chamber relative humidities and temperatures were maintained at 44.4 and 42.5% and at 21.2 and 21.7°C during a series of 1-h combustion tests of the smoke product at 500 and 250 1/min air flow rates, respectively.