How to choose the silent fan buying tips

1. Judge the quality of the plastic parts of the appearance of the color of the silent fan, it is best to choose white-based, must be injection molded out of the white, not the white spray oil, you can buy by observing the product inside and outside of the color is consistent to judge. Because the white products must be raw materials to produce, and spray color products can be used second-hand material (scrap) to produce, and then sprayed with color to cover up the poor quality of plastic products. The market more than 100 pieces of mute fan is mostly sprayed color, this point we can go to test. This method can also be used to buy other pigmented products. Plastic raw materials than the second-hand material is about twice as expensive. 2. Determine whether the brushless motor or brushed motor to check the wind out of the gap edge of the black powder, pay attention to be sure to see whether it is black, if the edge of the black powder, indicating that the manufacturer used a carbon brush motor to produce silent fan, and carbon brush silent fan in the process of running will continue to wear the carbon brushes, but also the black powder blown out. This brush motor life is generally below 2000 hours, that is to say, if you use 10 hours a day, half a year or so the motor is scrapped. Truly silent fans should use brushless motors, which require a digital control chip to drive and have no life expectancy. If you can disassemble the machine to check, there is no driver board (not the control board for switching, adjusting air speed, remote head, etc.) products must be using a brushed motor. A true silent fan has a larger driver board, a control board for switches and other functions. Brushless motors are about twice as expensive as brushed motors. And a brushless motor sinusoidal driver board price of about 50 yuan, that is to say, the light motor and driver board, brushless than brushed about 70 yuan. 3. Check whether there is a flour flavor adjust the silent fan to the maximum wind speed, with the nose to smell the wind blowing out, whether there is a smell (carbon powder flavor), if there is a smell must be brushed motors, we can not be fooled. 4. Check whether there is a high-frequency Noise adjust the wind speed of the silent fan, will be close to the ears of the air inlet, listen carefully to the sound, if there is a clear motor sound (high-frequency sound), indicating that the fan using the driver board is not a sinusoidal wave, but a square wave, the quality is not up to standard, and the longer the use of the time, the louder the sound will be.