Review on AeraMax Purifier Allergens 4 Stage Purification Heating, Cooling & Air Quality by Erica Johnson

Everything seemed to work very well at first. I changed the filters when they were filled with dust. I've collected a lot of dust. I would say it started making that high pitched beep after about 6 months of use. I think it had to do with the motor it's sucking air with or something. All I know is that it came from within, which really disappointed me. I had to throw it away because it was so noisy every time I used it. I need something that will last and this wasn't it.