Actually not so keen on such xiaomi air purifier.

It is like another massive device on the wall that take up the place.

Have to put each unit on every room. 1 unit can't tackle for the whole house. Specially double storey.

Such device are mainly for room rather hall or dinning area. We always open the door for such area. While room is close (if aircon).

Still prefer centralize unit which hide ontop. Probably cost around 3.5k.

Or DIY. Not a difficult machine.

There is no specific for high rise. It can be use on any building and house. Even in Japan, I see such air exchanger in 2storey house. But why they need it since Japan don't have air pollution.

Such a system is for close house in winter or extremely hot summer. They cannot open the window or door to let the hot/cold air out. Such a system is needed.

It is same function as air cleaner in local we use. But instead recycle the internal air, this unit suck in fresh air with filter out.

For aircon room which it seal out, exchanger air is better. It also create + pressure instead exhaust out - pressure. (Which will suck in dust)

I don't really like this unit as it look crowded in my small home.

1) Sharp is reliable and plenty of filer spare around.
2) Don't need a humidifier. It will get the room warmer and increse your bill.
3) Good coverage with a smaller size. Function as what it should do.
4) Match the coverage room size with a suitable size model. Many fail to do this and complain the unit no good.

Go to the website and choose the correct coverage model.

There are about the same. The main ingredient is Hepa filter and Carbon filter.

The rest feature is add on like ionizer, feature information and controlling and design efficiency.