For testing, we operated the air purifier after smoking in the room, and while it couldn't completely remove the odours, it brought the air quality from over 200 to under 50 in roughly 10 minutes.In auto mode, the purifier immediately revved up, in a hall that's around 20 feet X 20 feet. The noise got fairly loud at this point, but the purifier was also very effective at bringing the levels down quickly. The readings on our air quality monitor showed the PM 2.5 count dropping, and within two ...

avarage

Guys beware, I hv just applied for return of this product as the box mentioned date of import Dec 2017.. they are selling you a more than 5 years old manufactured electrical product where technological changes happen so fast.

Super perfect..I buy in 12000 only