HAZE MACHINE

'Haze machines', or haze generators, are similar to fog machines in that they produce droplets suspended in the air which are designed to make light beams visible.
Unlike conventional fog which can be dense enough to become opaque, haze is very thin. Ideally haze is barely noticeable, if at all, in normal lighting conditions. This allows the operator to fill a venue with haze prior to an event without creating a visibly distracting cloud.
Haze also has a substantially longer hang time than conventional fog. While conventional fog may hang in the air for up to 5 minutes, a typical water-based haze can last 1 hour and oil-based haze 6 hours or more, depending on the size of the venue and the amount of ventilation.
Some haze machines use a compressor to atomize a fluid (usually, though not always oil-based), therefore they do not require any warm up time. Other machines use a heater to vaporize the fluid (usually water-based). Most oil-based haze fluids use a mineral oil base, and most water-based fluids use either a glycol or glycerol base.