A smoke exhaust fan encountered a malfunction during operation, which is inevitable. Only by identifying the cause and finding a solution can the root of the problem be addressed.

Due to the presence of water in the oil, a failure occurred in the exhaust fan. The excessive water content in the oil resulted in moisture in the smoke. When this moisture comes into contact with cooler pipes, it condenses into water. Under the condition of poor drainage from the smoke separator at the exhaust fan outlet pipe, the condensed water reverses back through the outlet pipe into the fan housing. It then enters the motor from the fan housing, causing the insulation of the coil to degrade, leading to the motor's burnout.

2. Due to the oversized fan selection during the renovation, to reduce the bearing housing vacuum, the fan outlet damper was closed to 20% of its opening, ensuring a negative pressure of -150 to -250 Pa in the main oil tank. This resulted in the exhaust fan being under pressure, combined with the reduced damper opening, making it difficult for water and oil to be expelled from the housing. Over time, this led to their accumulation within the fan housing, eventually causing damage to the motor upon entering it.

Due to motor sealing issues, there was a failure in the exhaust fan caused by the entry of moisture into the motor, leading to motor burnout. Adjusting the fan outlet damper to 20% created pressure inside the fan housing, making it easier for moisture to enter the motor, thereby increasing the frequency of motor burnouts.