CHAPTER 20
SMOKE MACHINES
Smoke is used to create many effects. The smoke provides a medium for the beams of light so that the beams can be seen rather than just illuminating the stage floor. All smoke machines become hot as part of the process of making the smoke and must be handled very carefully.
FOGGERS 
Fog machines use water- or oil-based fluids to produce a vapor that looks like puffy smoke and is spread across the stage with fans. Because fluid vaporization is never complete, a residue eventually builds up and must be cleaned regularly to maintain optimum machine performance. Place the fog machine so that the area in front of it is clear ...
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