1. DIGITAL CONTROLLER Manages the internal temp by controlling the fuel and oxygen supply to the firebox. 2. AUGER MOTOR Turns the auger which feeds pellets into the firebox. 3. HEAT ROD Ignites the pellets and a combustion fan keeps them burning. 4. COMBUSTION FAN The micro-adjusted variable-speed fan and auger motor allow you to keep your grill and food at the temperature you set. 5. FIREBOX The Venturi-style firebox creates the ultimate wood-burning fire, circulating pure hardwood smoke and flavor throughout the grill.