“What is the CADR and noise level for the 2nd (middle) fan speed?”
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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.
Sorry, there was a problem. Please try again later.Thank you for your interest. We do not publish the results of the square footage per fan speed rate. This is because once the machine has run on high after initial use in a sealed room (at 5 air changes per hour), the amount of clean air moving through the room will remain the same at any level. The only difference will be the speed of which it continues to clean the air (though again, after running on high, the air will remain continuously clean in the marketed square footage). The sound level range is 25 - 53 dB(A).
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