Abstract: Apparatus for producing hot air for inhalations at stabilized pressure and temperature, comprising a source delivering air at a constant pressure, an electric resistor in contact with that air under pressure, an intermediate chamber receiving all of the hot air and opened to atmosphere in adjustable manner, and an inhaling device (e.g. a mask), said intermediate chamber being in communication with the inhaling device (4) through means (11-12) limiting to the hot-air flow rate into said device to a minute value with respect to the flow exhausted to atmosphere.