Is 352 a miscellaneous brand?

Not exactly. According to the inquiry of official website of Beijing 352 Environmental Protection Technology Co., Ltd., 352 is not a miscellaneous brand, but a brand specializing in air purifiers. 352 air purifier is a product of Beijing 352 Environmental Protection Technology Co., Ltd., which adopts German EBM air suspension centrifugal fan and is equipped with self-developed high efficiency air filter.