These devices generate a translucent mist or fog, utilizing a water-based fluid, typically composed of deionized water and glycol or glycerin. This fine aerosol hangs in the air longer than traditional fog, enhancing the visibility of light beams and atmospheric effects, particularly in entertainment settings. A typical unit incorporates a heating element to vaporize the fluid and a fan to disperse the resulting haze.
The longevity and subtle nature of the effect offer significant advantages over denser fog effects. This allows for a more nuanced atmosphere enhancement without obscuring vision. Historically, atmospheric effects relied on oil-based or other chemically complex solutions. The development of units utilizing water-based fluids provides a safer, less odorous, and more environmentally friendly alternative for theatrical productions, concerts, and other events. This shift reflects a broader trend towards sustainable practices within the entertainment industry.