Low Lying Fog Machine: TCFUNDY 1500W fog machine is excellent for producing low-lying fog. This fog will stay close to the ground and not rise much so it s better for creating an atmosphere that s mysterious. It produces 18000 CFM (c.f./min) of fog that covers 10-100 of space, 2L tank capacity that allows for long-lasting fog production. Size: 24.8 x 12.2 x 12.2 . Weight: 25.9 lbs. Dry Ice Fog Machine: Just uses fog juice and ice to create luxurious and long-lasting low-lying fog, we recommend to use dry ice, it produces longer-lasting, thick, beautiful fog that is more dense and prone to stay low.