1. Cleaning and maintenance of the inner box of the walk-in constant temperature and humidity machine: maintenance is required at any time before work. 3. Power distribution room cleaning and maintenance: regular maintenance every six months. 5. The replacement of the test cotton cloth in the walk-in constant temperature and humidity room: When it becomes hard and unclean, it needs to be replaced at any time, or regularly every three months. (This item is for the maintenance of the wet cloth of the constant temperature and humidity test box, which is not available in the high and low temperature test box). 7. Condenser cleaning and maintenance: clean dirty items at any time to avoid affecting heat dissipation. 9. Walk-in constant temperature and humidity room over-temperature protector: When working for a long time or before working, you need to check it at any time, and you can check it once a month when it is not frequently used.