NEBULA has a continuously variable system, which, via an ultrasound generator, supplies energy to the water, producing microscopic droplets (smoke effect). These, which pass into the incubator through the supplied tube, are instantly vaporised on contact with the heat in the incubator, creating moisture. The fan of theincubator homogenises the humidity within it. Furthermore, the humidity in the room where NEBULA is placed does not influence its operation. In fact, the ideal environment for use is the same as that of the incubator with which it is associated, i.e. inside one's own home or in a temperate environment.