An inhaler device has a vessel containing the substance to be inhaled and a lid helping to vaporize the substance to be inhaled. The lid includes a generally central opening and several openings positioned in a ring around the central opening. The central opening is formed such that it extends deeper in the vessel than the several openings that are arranged in a ring. The cross-sectional area of the central opening are generally equal to the sum of the cross-sectional areas of the several openings for enabling a sufficient quantity air to be drawn into the several openings to vaporize the substance to be inhaled.

A portable warm air humidifier for delivery to a room a steam air mixture of uniform moisture and at a temperature that does not cause sensation of pain. A steam ejector is used to mix the steam from an evaporation chamber with the air entering the humidifier with the advantage, among others, of eliminating the need for motors and blowers. A difference in the water level between a water supply compartment and the evaporation chamber provides a constant pressure in the evaporation chamber which is necessary to drive 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 humidifier may have 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.

The components of an electric warm-air humidifier are enclosed in a housing resting on a base having a water supply compartment. The housing includes an evaporation chamber in the shape of an inverted cup which has a steam outlet in its top and contains an electric heating element positioned a short distance above its open end. The evaporation chamber and the heating element are immersed in water contained in the water supply compartment. The neck of an inverted, removable, water container filled with water is placed into the water supply compartment and water fills the water supply compartment until its level reaches the lower rim of the water container's neck. The housing and the water container are displaceable from the base so as to provide access to the water supply compartment and the heating element to facilitate cleaning. The humidifier also contains a control element to prevent damage to the heating element when the heating element is not immersed in water and signal lamps warning an attendant to refill the water container with water.