Keep it cool
The fog that a machine like this produces is very light, and dissipates quickly, so it won’t be able to withstand even a hint of wind. If you want the fog to come out thicker and stay lower to the ground like in the shot below, cool it down. In colder conditions this will happen naturally, but when it’s warmer, a makeshift tube half-filled with ice cubes works perfectly. Directing the nozzle through the tube will force the fog through the ice, making it emerge thicker and heavier out of the other end.