... extends the service life of the cooling fans, saves the power and improves the working efficiency. 6) Low noise but ... lights, and etc. 2) Industry equipments series: solar energy, wind power, gas discharge lamp and etc. 3) Office area: Computer, ... Electric fans, vacuum cleaner, AC, lighting lamps, and etc. 6) Power tool series: electric saw, drilling machine, punching machines, air compressors, and ...