A:AnswerHi, Blueair Blue Purifiers are designed to filter pollutants and particles and also does well with light smoke and cooking odors. For stronger odor removal we suggest models with activated-carbon filters such as the Blue Pure 211+ and 211+ Auto.
A:AnswerHi Nita, all of our air purifiers are "whisper silent" on their lowest setting. The 311 Auto has a sound level range of 23 dB(A) on its lowest setting to 53 dB(A) on its highest setting.
A:AnswerHi there, we do not provide the measurements of the pre-filters themselves. Your model is compatible with the pre-filter of the same name. For example, the 311 Auto model would be compatible with 311 Auto pre-filters.