The patented Opti-myst® flame effect uses ultrasonic technology that produces a fine mist to create the illusion of flames and smoke. This versatile 50" firebox can be installed as a one-sided or see-through fireplace, offers river rock, black rock and driftwood media bed options and a built-in fan-forced heater. (Kit includes: Opti-myst® Pro 1000 Firebox (CDFI-BX1000), Opti-myst® Pro 1000 Cassette (CDFI1000-PRO) and Front Glass Kit (FG1000).