“do i need a carbon filter for the 211, and if so how many times do i need to change it”

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• HI there! This unit, the 211+ already has carbon in its filter. You'll want to replace the filter after 6 months of use. There is an internal timer that will let you know when it's time to change the filter (the button on the unit will change color when it is time).

  Answered by Blueair Support Team 7 years ago

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• It should be every 6 to 12 moths or the device will let you know when it’s full and needs to be replaced

  Answered by Anonymous 7 years ago

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