GFB100 Vent-Free Fireplace Blower. Improve whole room heating with this 2-in-1 mode fan MANUAL MODE – Turn ON at the flick of a switch AUTO MODE – Fan automatically operates when the heater gets above 113 degrees Fahrenheit to ensure it’s blowing ONLY warm/hot air Includes power supply (6′ Cord Length), and all necessary wiring Designed and certified to only operate with Vent Free Fireplace Systems.