“What is the DB of the second fan speed? (the one I presume using most). Does the 25 db lowest sound level apply to the 0 setting or the 1 setting? Some websites state the device has 3 settings (1-3); others state it has 4 settings (0-3). Unclear for me.”
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This German guy tests the db (noise level) on 1 meter distance from Protect 7770i: https://www.youtube.com/watch?v=KZ3eaVsjzms. His results: - fan speed 1: 38 db - fan speed 2: 48 db - fan speed 3: 58 db Note the db is a bit higher than the official 55 max db that BlueAir states. Maybe there is a deviation in the sound meter this guy uses. But then now you all know the ratios now. I presume the official 27 low db is for night setting "0". Looking at other purifiers and their db and CADR ratios, I would estimate CADR of fan speed 2 being around 400 m3/h; still very high for a purifier on this sound level and quality of filtration. I have been surfing the internet for hours looking for this information, because I feared the gap between fan speeds being bigger and making the purifier less interesting for me, yet I feel more convinced now to buy and hence like to share this info for others.
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