Wind noise generation

Some negative ion generators have built-in fans/motors. We suggest you should know the noise levels generated by the ion generator before you purchase it especially if you are going to install it in the bedroom. Wind noise generation Wind noise generation - (Extract from "Pay attention to specifications") Specification item Example Importance Wind noise generation No noise due to no fan Middle Some negative ion generators have built-in fans/motors. We suggest you should know the noise levels generated by the generator before you purchase it because you may be disturbed by the noise. The industry's highest performance negative ion generator [Users testimonials] Good sleep 74%, Alleviation of migraine 85%, Less shoulder pain 66%, Feel refreshed 76%