a turbo - charcoal barbecue is designed with five main features ; a detachable turbo unit , an adjustable rotisserie ensemble , a moveable charcoal tray , removable ash trays , and fire screen . the detachable turbo unit is positioned to recirculate hot air from underneath the charcoal tray and redistribute the hot air to the upper and lower areas of the grill . the turbo - charcoal barbecue includes an adjustable rotisserie ensemble . both the turbo unit and rotisserie are driven by a 12 volt motor or from an electrical outlet using a transformer . the charcoal tray sits on a plate which is attached to a crank shaft mechanism used for raising and lowering the charcoal tray . a rectangular shaped fire screen contains small holes spaced evenly apart from each other designed to both block flash flames and allow the heat produced from the ignited briquets to flow through it . the lower chamber of the barbecue pit collects expended ash material and beneath the lower chamber are removable ash trays that collect ashes that are swept down chutes from the lower chamber .