Industrial wall fan of the purchase points

A fan of the use of electric motors to rotate the blades, thus accelerating the flow of indoor air, has reached the purpose of cooling. What are the points that we have to pay when we buy a wall fan? The following to introduce the following:
1. Look at the net and the leaf
The appearance of the industrial wall fan is intact, check whether the mesh cover and the blade are deformed. In the assembly of a good wall fan cover, with a pen pointing to the highest point of a fan, slowly move the fan, the other few leaves corresponding to the distance between the tip and the tip should be very similar, and then check the fan's rotation flexible.
2. See start performance
Start performance is an important indicator of the quality of industrial wall fans. In the purchase, the wall should be adjusted in the slow speed, and the power supply rated voltage of 85%, that is, with a voltage regulator to 220 volts to 187 volts when starting the industrial wall fan, should be able to start from the static, Can maintain normal operation, if the shorter the start time, indicating the better performance of industrial wall fan start. The shorter the time required for an industrial wall fan to start from normal operation, the better the starting performance of the fan motor.
3. Look at the operation and speed performance
Power on the shaking his head after the switch several times, check whether the failure or assembly too tight, in this process, the fan mechanical transmission part should not have abnormal noise. Wall fan in the high, medium and low speed operation, the motor and fan should be smooth, small vibration, low noise. Wall fan shaking his head, shut down should be agile, no intermittent, stagnation and jitter phenomenon, the block speed difference should be obvious, the air angle the bigger the better. When the fan stops, the shaft axial clearance does not exceed 0.5 cm, the gap is too large, the operation will cause axial movement and impact sound.