Fermenting room of DC series is a special equipment for quick-frozen pastry fermentation, and the equipment is manufactured according to the "HACCP" requirement of the food industry. The temperature and humidity sensor is equipped at the air-return inlet of fermentation room to automatically control the heat exchanger and steam spray device, so as to achieve the accurate control of fermentation temperature and humidity. The accuracy of temperature control is within ± 1.5 ℃ and the accuracy of humidity control is within ± 2%, realizing the ideal effect of the air temperature and humidity. The whole process is controlled by a microprocessor-based programmable system or a digital display system. The system is stable, reliable, low in power consumption and easy to maintain.