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How much sound do the fans make? Are they noisy?

SpeedComfort is very quiet. In a completely silent environment you will hear them, however, with any regular background sound (such as people talking) you won't notice this. Our fans have a noise level of less than 20 dB. For comparison: the average noise level of a modern refrigerator is about 39 dB and most (if not all) fridges classified as 'silent' won't make it under 30 dB. 

Fun facts: a pin dropping is 10 dB, rustling leaves 20 dB (so comparable with SpeedComfort) and whispering is 30 dB.