SleepFans are quieter than any equivalent fan that we have found on the market, due to our unique blade design.
Think for a moment about all the “typical” fan blades you see - flat pieces of metal or plastic inclined at an angle. You never see that design on an aircraft because it is inefficient and noisy. But what does this mean, practically, as it relates to noise?
The graph below shows a comparison of the sound levels of the SleepFan blade to that of a typical fan blade, for a comparable amount of air movement.* The SleepFan blade is, on average, 5-7 decibels quieter at comparable levels of air moved. What, exactly, does this mean? While oversimplifying a complex topic, a decrease of 10 decibels in noise is generally perceived by a person to be about half as loud. So, yes, our fan is quieter than a typical fan.
*SleepFans are very efficient when compared to conventional fans. That is why it is important to understand the comparison of sound levels in relation to the amount of air moved. Some fans may appear to be quieter only because their blades spin more slowly, moving very little air. The SleepFan moves as much air on low as other comparable fans do on high, causing the soothing sound to be quieter than other fans, as it relates to the volume of air moved.