Blueair Blue Pure 211+

“duct tape a 20x20 furnace filter to a box fan. Won't find a cheaper effective air purifier. i used 1000merv for it. I have a blueair 211+ which i paid 400$ for and the filters are about 80$ each (changed once every 6 months) and the furnace filter boxfan combo is almost as effective. Really almost the same thing as the blueair minus the carbon filter. I have asthma from a auto-immune condition, and even grease from cooking messes me up, but i just keep the boxfan combo in the kitchen area and is a massive difference. Can also get the furnace filters for dirt cheap any time other then winter. (since thats when most people boot their furnace up and actually need the filters, so the price goes up because of demand.) I paid 50 for a hurricane brand boxfan brand new because that was what was recommended and 20$ for a 4x pack of merv 1000 furnace filters. honestly can prob use any fan though and likely can get them dirt cheap at a local 2nd hand store for like 15$ and been plenty. I actually have been considering selling my blueair and just getting a bunch of box fans/furnace filters. Fans are cheap and the filters are cheap, for the price of my blueair i could of had 10 box fan combos going in every room and still had cash to spare AND better quality air. TBF though, they do look like shit in comparison to a actual solution. I will also add that IMO, levoits products are useless. had some really bad experiences with their products breaking fast and not really providing much help in air quality”