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At its lowest setting
The first stage should be checked every three months and replaced once a year
the SL3681 gives you an impressive cleaning radius so you can tackle more floor space with fewer outlet changes
Protect the main filter of your Blueair Pure 211 Air Purifier with a pre-filter available in five snazzy colors
Blueair 403 Air Purifier Sanitaire canister vacuum At its lowest settingCompare Blueair Air Purifiers Blueair 403 Product Manual Blueair air purifiers are the ideal machines for people with allergies, asthma, and other respiratory conditions, or for anyone who wants cleaner, more breathable air. Using Blueair's patented, two stage HEPASilent filtration technology, the 403 effectively cleanses the air of 99. 97% of the allergens and micro organisms down to 0. 1 micron in size. The 403 is recommended for rooms up to 365