Our unique designed rectifying air-flow system allows for best and excellent cooking of meats with natural flavors and juices. For safety, in addition to the Flame Failure Safety Device and Back-Fire Protection Device, etc., a high efficiency Oil Filter and A large capacity Water (Drain) Pan are equipped on roaster unit. Minimized internal cooking components are easily removal for daily cleaning. Gas Metal Heating Plate Type Model NJG-M Gas Ceramic-made Charcoal Type Model NJG-S Charocal Type (With a gas burner) Model NJG-C