Apparatus and equipment for medical and therapeutic purposes, in particular equipment and apparatus for supporting breathing for the sick; equipment and apparatus for supplying gas to human beings for medical purposes, in particular equipment and apparatus for sleep therapy or oxygen therapy; masks for supporting breathing and supplying oxygen to the sick and to patients; equipment and apparatus for maintaining, regulating and caring for breathing in individuals with breathing problems, in particular in sleep phases; masks for supporting breathing for and supplying oxygen to individuals with sleep problems; devices for the treatment of sleep apnoea; apparatus for humidifying the respiratory tract, inhalers