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Sorry, there was a problem. Please try again later.The 211+ is larger than the 411. Alone, neither is adequate for your size house.
Sorry, there was a problem. Please try again later.I have three 211+ Blueair units. Each one is good for 540 square feet. So, I have very pure smelling air in my home. The stated micron particle size is 2.5 microns which I was looking for.
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