Blueair 402 Air Purification System Review

Blueair 402 Air Purification System
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After reading reviews a number of places online, I decided to buy the Blueair products. In ended up sampling the 402, 501 and 601, and ultimately returned the 501 and 601 and replaced them with 402s.
The 402 is truly quiet. This was an important consideration for me; the reason I returned the 501 and 601 was because they were noisy. The 402 has four fan speed settings. The fastest is unpleasantly noisy; I would not want to be in the room while the unit is in this mode. The next fastest, though, is *much* quieter. We usually leave the units in this mode. Sometimes we use the next-to-slowest mode, for example when I'm watching a movie and sitting in a chair right next to the 402. The middle two speeds are sufficiently quiet that I never feel like I need to use the slowest speed. (The 501s and 601s are unbearably noisy at any but the slowest setting - which is slower than the middle speeds of the 402. For 2/3 the price you can move more air, more quietly. Go figure.)
The only downside to the unit is size. It is about the same size as a tower PC. It's tall enough not to easily fit under furniture, and it's airflow pattern (in one of the skinny vertical sides, out the opposite side) means that the best placement is with one of the long sides against a wall. If wall space is at a premium, it can be hard to find a place to put it.
I haven't had the units long enough to replace the filters yet, but I have taken out the filters that came with them, and put them back in. It was very easy to do. After two months, only one filter is showing any visible dirt - but the house is *much* less dusty.

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Blueair is the system for people living with alergies, asthma or other respiratory conditions, or for anyone who wants cleaner, more breathable air. A revolutionairy combination of advanced filter media and an encapsulated ion particle charging chamber makes it possible for the Blueaur air purification system to achieve better results than either technology alone. Our patented HEPASilent filter technology is proven effective at capturing 99.97% of the tiniest 0.1 micron particles. The quietest unit in the industry, Blueair's low-density filter clean larger volumes of air more quietly than any other unit in the industry. Hence the name HEPASilent(r) a Blueair Exclusive. Bacteria-resistant filters, Blueair's filters are made of bacteria-resistant polypropylene. Because polypropylene is waterproof, the filters naturally reist contamination from bacteria, viruses and mold without chemical additives or washes. And the filters only need replacement every six months, a process that takes under 30 seconds.The Blueair 501 is for room sizes up to 365 square feet.10 year limted warranty, Award-winning Swedish design

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