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Thank you for your interest in Blueair. The 411 is rated for 161sq.ft. while the 211 is rated for 540sq.ft. Both have the HEPASilent level on the lowest level of the unit. The shape of the units are different with the 211 being much larger. The 411 series is a very popular bedroom unit, but if your space is larger than 161 then I would recommend the 311Auto or 211+ unit. Please email [email protected] if you have any additional questions and we would be happy to help.
Sorry, there was a problem. Please try again later.Don't know about 211. Before the 411, I used a sound machine for sleeping. So I like the sound of the 411. The first and second level sounds are much less than the third setting.
Sorry, there was a problem. Please try again later.Had the 411 for about a month. Use in living room with power setting on two (of three). Consider it quite quiet, but of course, that’s relative to the individual. Noticeable noise difference between settings two & three.
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