Low lying fog can be fantastic for those creepy photo shoots, especially out on location. Or, perhaps you’re trying to recreate the look of a particular 80s pop music TV show. Whatever your reason, low lying fog often works much better than a more elevated smoke-filled atmosphere choking your subject.
The basic principle is quite simple. The smoke machine blows smoke into a hole on one side of the box. It gets cooled by the chilled air inside, thus becoming heavier than the warmer outside air. When it escapes from the exit hole on the other side of the cooler, it stays low to the ground.
For best results, dry ice would work better than regular ice as dry ice is much cooler, so the fog stays colder for slightly longer. If you’re using regular ice, as the smoke is light, you want the smoke to flow over the top of the ice. If you’re using dry ice, as CO2 is heavier than air, you want the smoke to flow below it.
Using this method, you can put low lying fog pretty much anywhere. In a studio, the creepy forest, or even on top of a swimming pool.
One tip, though. If you don’t want your room filling with smoke, make sure to tape up the lid before you fire up the smoke machine.