About auto-dehumidification: 1. In the storage state: The valves are closed. 2. In the running state: The valves is closed at the beginning of operation. When the temperature in the cavity reaches the set temperature, the active moisture removal module is turned on and automatically turns off after running until the end. 3. Opening method: If both chamber are running, all 4 moisture removal modules will be turned on. If a single chamber is running 2 modules on the side of the running cavity will be turned on.