System for the delivery of a liquid substance in the form of saturated dry steam for a respiratory therapy through a nasal and/or oral device, comprising: - a support body; - a reservoir for containing the substance; - pickup means, removably connectable to said first reservoir; - dispensing means of the substance, said dispensing means being in fluid connection with said pickup means, said dispensing means having a passage section of the substances presenting an area and a geometry configured to allow the delivery of the substance according to predetermined direction and speed parameters; - first mechanical vaporization means of vibrating type, configured to apply vibrations to the substance contained in said reservoir; - second heating vaporization means, configured to release thermal energy to the substance contained in said reservoir - a control unit configured to control the actuation of said first mechanical vaporization means and said second heating vaporization means according to a predetermined delivery program, wherein said predetermined delivery program defines at least the frequency and duration values of the vibrations applied by said first mechanical vaporization means and temperature values and duration of the heating operated by said second heating vaporization means, said predetermined delivery program being associated with the type of therapy and of substance to be delivered, wherein said first and second vaporization means are configured to be activated jointly depending on an automatic or manual selection, wherein said reservoir, said dispensing means, said first vaporization means and said second vaporization means are configured to be removably connected to said support body in such a way as to create a modular system, characterized in that said first vaporization means is configured to apply to the substance vibrations at ultrasonic frequency comprised between 4,5 and 5,5 MHz generating an energy density comprised between 10-13 W/cm 2, and said second vaporization means comprises induction means supplied with current at frequency comprised between 15 and 25 KHz and configured to bring the temperature of the substance to at least 250°C, in such a way as to bring the substance contained in said reservoir into a dry steam state, the configuration of system being such as to achieve the vaporization of the liquid substance in the form of saturated dry steam in a time shorter than 1 second. - a support body; - a reservoir for containing the substance; - pickup means, removably connectable to said first reservoir; - dispensing means of the substance, said dispensing means being in fluid connection with said pickup means, said dispensing means having a passage section of the substances presenting an area and a geometry configured to allow the delivery of the substance according to predetermined direction and speed parameters; - first mechanical vaporization means of vibrating type, configured to apply vibrations to the substance contained in said reservoir; - second heating vaporization means, configured to release thermal energy to the substance contained in said reservoir - a control unit configured to control the actuation of said first mechanical vaporization means and said second heating vaporization means according to a predetermined delivery program, wherein said first and second vaporization means are configured to be activated jointly depending on an automatic or manual selection, wherein said reservoir, said dispensing means, said first vaporization means and said second vaporization means are configured to be removably connected to said support body in such a way as to create a modular system, characterized in that said first vaporization means is configured to apply to the substance vibrations at ultrasonic frequency comprised between 4,5 and 5,5 MHz generating an energy density comprised between 10-13 W/cm 2, and said second vaporization means comprises induction means supplied with current at frequency comprised between 15 and 25 KHz and configured to bring the temperature of the substance to at least 250°C, in such a way as to bring the substance contained in said reservoir into a dry steam state, the configuration of system being such as to achieve the vaporization of the liquid substance in the form of saturated dry steam in a time shorter than 1 second.