Two types of circulation, forced and natural convection, in one unit (compatible with model 300/400/600) Eco-oven with digital variable wind velocity from 0-10 steps and adjustable damper. Program featured to reduce power consumption significantly. Superior heat tightness and insulation of chamber. Excellent dust tightness, dust can hardly enter the chamber Air velocity changeable in 10 stages using digital setting of controller. Standard with 99 step program operation with repeat operation, auto start, auto stop and quick auto stop functions. Adjustable damper position at chamber front to optimize operation. Fluorescent display, interactive input method, calibration offset function.