In the stage of buying new fans, I know something about the new fans of major brands. The dreamer, Panasonic and Philips mentioned by the subject all appeared in the professional testing of fresh air system in Zhongguancun and Chinese Academy of Sciences. Through comparison, I found that the dreamer M200 performed well in the column of actual air volume, while Panasonic FV-09ZVDH 1C and Philips FAP208 performed relatively poorly. Moreover, in terms of noise control, Dreamer M200 is also superior to the other two brands. Generally speaking, dreamers are bright, so I recommend these three brands of dreamers.