1994 Driall 773000 Trench Dryer Trench Burner, Overall Condition: Good; Wheels: Steel; Unit Runs & Operates As It Should?: Yes; Perkins 9383960 Engine, 30 Hp, Diesel, Tires Approximately 90i25 Fan Tunnel Causes An Air Vortex In A Trench To Burn Debris At A High Temperature With Little To No Smoke.