You have decided to invest in an air cleaner system but how do you go about choosing the best room air purifier for your home and where do you look for the best guidance. The good news is that you can find most of the information you need on the Internet. However, the majority of Internet sites are those belonging to manufacturers, whose main goal is to convince you that they offer the best home air purifiers on the market. Here are some tips on how to buy an air purifier while avoiding the confusing sales hype.