The Robo Fogger produces ground level water vapor fog. It is similar to a dry ice fogger but on a larger scale. The fog effect does not last as long as the LSG; however, it wont rise from the floor. Hot lights will kill the fog. The fog effect works best if walls are built around the stage to help contain the fog. If running continuously the nitrogen will last about 1 1/2 hours. Power source: 208V 3ph 50A Required Items: Liquid Nitrogen (Dewars tank); water source.