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Spec drill · Min noise

Blue Pure 311i+ Max vs Airmega 400

A side-by-side readout for min noise.

Blueair · Blue Pure 311i+ Max
23dB
Coway · Airmega 400
22dB
▲ Lead
VerdictAirmega 400 wins on min noise.
Context

Understanding min noise

Min noise is a numeric spec measured in dB. On this metric, lower values are generally better — smaller, lighter, thinner, or less demanding usually translates to a more comfortable or more efficient product. When comparing two products, focus on the percentage gap rather than the raw delta: a 200-unit lead means something very different at the low end of the range than at the high end. Pay attention to the unit, too — manufacturers sometimes quote peak or burst figures that are not sustained in real-world use. Cross-check the published number against independent measurements where possible, especially for performance and battery claims. Finally, remember that a single spec rarely tells the whole story; the Mars Score weighs min noise together with the rest of the spec sheet so one outlier doesn't distort the verdict.

This matchupBlue Pure 311i+ Max's 23dB is roughly 5% more than Airmega 400's 22dB (a 1dB gap). Lower is better here, so Airmega 400 takes the lead in real use.

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Other specs on this comparison

See the full Air Purifiers category for all products ranked by Mars Score.