Abstract: An electric warm-air humidifier consisting of a base, a boiler tray supported on the base, a heating element, a liquid supply supported on the base and having a discharge opening communicating with the boiler tray and adapted to maintain a given level of liquid therein and a vapor chimney supported on the base having a receiving end communicating with the boiler tray so as to receive vapor therefrom and a discharge end for discharging the vapor received from the boiler tray. Also included is an electrical supply for supplying electrical energy to the heating element and a switch mounted on the heating element and adapted to deactivate the electrical supply in response to separating movement between the vapor passage and the base assembly.

Abstract: Portable and personal-sized warm air humidifiers for delivering a steam air mixture having a uniform moisture at a temperature that does not cause a sensation of pain. A steam ejector is used to mix the steam from an evaporation chamber with the air entering the humidifier. A difference in the water level between a water supply compartment and the evaporation chamber provides a constant pressure in the evaporation chamber which drives generated steam through a steam nozzle communicating with the steam ejector. The dimensions of the steam nozzle are determined in relation with the rate of steam generation in accordance with steam velocity to effectively eliminate or minimize the noise normally associated with the passage of steam through a nozzle. The invention is also well utilizable in a humidifier having a filter medium to filter particulates from the air notwithstanding the drop in pressure of the air across the filter medium from the outside to the interior of the humidifier.