High-performance, energy-saving, programmable 300L constant temperature, forced convection oven with air velocity control and exhaust dampers. 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 off-set function. Operating temp ambient +15~260°C.