How Effective are Silent Hand Dryers
Hand dryers are designed to displace moisture from a surface to dry it through a combination of air movement, evaporation and in some cases using heat. When designing a hand dryer, engineers need to consider a variety of factors including the temperature and air speed to maximise drying while remaining as energy efficient and quiet as possible.
One way to reduce the amount of noise a hand dryer makes is to reduce the amount of air which is being pushed through the system. Slower moving air will create much less noise because it creates less turbulence and requires less fan power, however if the air is moving too slowly, it will not be enough to remove water from hands and the dryer will not work effectively.