Only Cal Flame goes green with Green Heat Technology. This unique innovation, which reduces emissions in burning wood, is available on Cal Flame fireplaces with the wood burning option. Other wood burning backyard fireplaces simply burn the logs and release untreated emissions into the environment. Cal Flame rectifies this ecological problem with the exclusive Emission Recovery System – or Green Heat. When the fuel is combusted, it releases its noxious by-products through the chimney, where Cal Flame engineers have installed a unique catalytic converter. A powerful fan forces the emissions through the catalyst before expelling them out the chimney. Tests show that this Green Heat system reduces emissions by at least 25%! There is no other Green Heat fireplace in the industry!