Mi 2S Vertical Air Purifier

The Mi Air Purifier 2S may be a small, white cuboid that hardly reaches up to my knees. It’s much smaller than I expected and is surprisingly light.

But don’t let that weight fool you. Chinese products have a reputation, perhaps undeserved, for being cheaply built, but the Mi 2S is that the exact opposite of that. Nothing about it feels cheap.
It’s a nicely built and finished product with sturdy panels and solid buttons that desire they might last a very while. It’s also well-designed. Opening the rear panel to access the filter is straightforward, and therefore the design is so thoughtful that the purifier will turn itself off the instant you open the panel.

3 Stage filtration is being used by Xiaomi for the filtration process an outsized outer filter capture all the larger particulate like dust, hair and fur. The inner filter may be a HEPA H11-grade filter (high-efficiency particulate air) that’s designed to capture microscopic particles.

 H11 simply defines the efficiency with which the filter operates, which is 95 percent during this case. A costlier filter, like one from Dyson, might use an H13 or H14-grade filter that filters with a 99.95-99.99 percent efficiency, but H11 is quite enough for many homes