The GMG Difference A digital controller manages the internal temperature by controlling the fuel and oxygen supply to the firebox. A motor turns the auger, which feeds pellets, into the firebox. A heat rod in the firebox ignites the pellets and a combustion fan keeps them burning. A micro-adjusted variable-speed fan and auger motor allow you to keep your grill and food at the temperature you set. The Venturi-style firebox creates the ultimate wood-burning fire, circulating pure hardwood smoke and flavor throughout the grill. greenmountaingrills.com