Features: 1. The running status can be displayed visually. 2. Equipped with fan and lighting switch. 3. VAV variable air volume system control function. 4. Equipped with intelligent automatic delay shutdown function to completely evacuate the residual corrosive gas to protect the service life of the equipment. 5. Strong exhaust function in emergency. 6, temperature setting function, when the temperature inside the cabinet exceeds the set value, the system will alarm 7. Voltage adjustable function (0 ~ 220V). 8. Automatically set on / off function. 9. Clock display function, effectively control the experimental time. 10. Wind speed alarm control device for option. 11. Purification function is matched with outdoor exhaust gas purifier.