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None , because of their pathetic after sales service or rather lack of after sales service for Air Purifier. They will not repair the Air Purifier at service center and suggest you to find an engineer your self. Attached here is screen shot of chat with MI representative.
I have the Guardian Technologies air purifier. This purifier is worth every damn penny. It is the second one that I have and I wouldn't change it for another one. That's how good it is. You know, for someone an air purifier might seem an insignificant thing, about he shouldn't think about, but it can make a big difference in your house. The better it is, the better its benefits will be. If you need a list of good air purifiers, on sustainableplanet.ca you can find it. I know that there are even people who don't think about getting one. These are uncaring people, which don't think about their health and their relatives one.