Product comparisons to help you choose.
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Blueair 511i Max
ASIN B08KPJ76RR
311i Max
ASIN B0BN2LZ9JH
For a smaller room and tighter placement, the 511i Max has the smaller published footprint and a 237-sq-ft recommendation at 4.8 ACH. The 311i Max is a larger-body option with a 439-sq-ft recommendation at the same stated air-change rate.
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Blueair Blue Pure 511
ASIN B08KPJCDN6
511i Max
ASIN B08KPJ76RR
Choose the 511 for three manual speeds; choose the 511i Max for Auto/Night and app control. They use different replacement filters. Available product information does not show which purifier cleans better.
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Coway Airmega 100
ASIN B0CDKHKBHD
Blueair 511i Max
ASIN B08KPJ76RR
These compact purifiers suit different room-size targets and care routines. Coway’s 405 sq ft rating is at 2 ACH; normalized to Blueair’s 4.8 ACH, it is about 169 sq ft.
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Dyson HushJet
ASIN B0FJPRQP71
Blueair Blue Pure 511i Max
ASIN B08KPJ76RR
There is no measured overall winner in the evidence reviewed. The Dyson is the narrower, taller option; the Blueair is shorter and marginally wider.
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