to add on, it helps in some cases to have another fan or two to move air (and dust) to your air purifier. i have 2 blueairs (211+ & 411 auto) and they do a dece

to add on, it helps in some cases to have another fan or two to move air (and dust) to your air purifier. i have 2 blueairs (211+ & 411 auto) and they do a decent job cleaning by themselves, but the fans aren't powerful enough even on high to draw all the crap being constantly kicked up farther than a few feet away without extra help.