1. Electrical aspects are mainly motor maintenance and secondary circuit wiring, basically no much workload 2. Mechanical reducer device, normal oil level, can be changed regularly for three months or six months. Blade angle adjustment is generally not adjusted according to the instructions for installation and commissioning, to see the current is not super, the air volume and so on. The blades are rarely broken. Generally, they may only run for a period of time when the installation angles are different. Other maintenance tasks are rare. The biggest problem is that the fan sounds loud. The vibration is also large. If the blade is not running for a long time, it may cause unbalanced vibration of moss.