If you want your air purifier to work really well and be the bestair purifier that is available in the market, make sure you know what you are doing. Check out the filter of the machine before you go in for one. Also find out the capacity of the air that it clean effectively. There is no use having a machine that says it can clean all the air that you have. That is a downright lie. It would be a good idea for you to check out what your friends have; a good way of identifying the bestair purifier.