Blueair 402 Air Purifier with SmokeStop Filter - HEPA-Silent with Odor Control The 402 effectively purifies air in rooms as large as 365 square feet. Using patented two-stage HEPASilent technology it captures 99.97% of the tiniest 0.1 micron particles on level one including allergy-provoking pollen grains dust mites mold spores and pet dander particles. . Blueair is the system for people living with allergies asthma or other respiratory conditions or for anyone who wants cleaner more breathable air. . This same filter technology earned the larger Blueair units Best of Class ranking in independent testing of Clean Air Delivery Rates. The 402 provides comparable performance for mid-sized rooms.. Value-added features include quiet operation low energy use galvanized steel construction and easy maintenance: simply open the side slide out used filters and drop in replacements every 6 months.. CADR (Clean Air Delivery Rate): smoke 240 dust 250 pollen 255. 4 Filtration Speeds. 10 Year Warranty. . Includes smokestop filter with more activated carbon for better smoke and gas removal

Blueair 402 HEPA Air Purifier The Blueair 402 air purifier is a premium air cleaner for people living with allergies, asthma, or other respiratory conditions, or for anyone who wants cleaner, more breathable air. The Blueair 402 effectively purifies air in rooms as large as 365 square feet. Using patented two-stage HEPASilentTM technology, it captures 99.97% of the tiniest .1 micron particles on level one, including allergy-provoking pollen grains, dust mites, mold spores and pet dander particles.

Blueair 501 Air Purifier with SmokeStop Filter - HEPA-Silent Air Cleaner with Gas and Odor Filter Quiet and efficient HEPA-like air purifier with smoke, odor, and gas removal. For those who want quality but quiet filtration. Popular for bedrooms of up to ~550 sq. ft. Recommended for people with allergies or asthma.
Customer Review: Better than great
Works very well at filtering the air. this one was actually too powerful for my bedroom even at the lowest setting. There is a noticeable difference in the air when the Blueair is on. All speeds are very quiet except for the highest setting which is disproportionately louder than all the other settings. The product itself is very sturdy and well made. For anyone with allergies this is a great product that will no doubt make a difference.
Customer Review: good
While it’s difficult to directly measure the effect that this air filter is having on the environment with any degree of certainty without tools to measure air quality it certainly seems to me to be doing a good job. I wake up feeling better, and my sinuses have stopped giving me trouble. I’m able to breathe much better, and through both nostrils, consistently; it’s been so long since I could do that I’d forgotten what it was like. I believe I’m even sleeping better because of it. And it is QUIET, on the low setting I dare say silent. I kept looking at the blue light to be sure it was on. The only complaint: I got the activated carbon filter and, apparently during shipping, some of the black dust got into the container an left noticeable black marks on a few places on the outside of the filter case. I haven’t found any cleaner that will take them off yet, very stubborn. Oh, and the shipping was kind of slow.