This video covers the top 5 air purifiers in the industry. They have been in business for many years, have a track record, review very well and well known. Airpura, Filterqueen, Blueair, Austin air and the IQ Air. I have tried to explain in detail all the benefits along with the filter replacement for all of these machines. From pre filter, HEPA filters and carbon filters. Feel free to send me an email if you have questions. Hayden Monsegue video.