The staff of the 3C smoke exhaust fan manufacturer will explain the key points of the size selection and design of the smoke exhaust fan to you, hoping to be helpful for your development.  
The main parameters of the smoke exhaust fan are operating temperature, air volume, air velocity (for 280℃ fire dampers), efficiency, noise, motor power, transmission ratio, and motor output power.  
1. The smoke exhaust fan should operate normally for a long time when the medium temperature does not exceed 85℃.  
2. The smoke exhaust fan should continue to work for 30 minutes when the temperature of the transported medium reaches 280℃, and can resume normal operation when the medium temperature cools down to the ambient temperature.  
3. The noise limit of the smoke exhaust fan at the operating point specified in the controller instructions of the smoke exhaust valve should comply with JB/T8690-1998.  
4. The air volume of the exhaust fan should be increased by a margin of not less than 10% to 20% based on the required air volume value.