Reducing Hand Dryer Noise
Conventional hand dryers can be noisy with sound levels reaching more than 80dB when in use. This sound is loud enough to penetrate walls and create disturbance in the surrounding areas which can be distressing for young children and distract people nearby. There are ways to reduce the impact of sound in the local environment through a combination of what design of hand dryer you choose and how they are installed and positioned.
What causes hand dryer noise
Conventional warm air hand dryers are known to create a lot of noise when in use. This is a side effect of their design and cannot easily be mitigated. A warm air hand dryer uses a fan to blow air over a heating element and then onto the hands of the user. The warm air causes the water left on the skin after washing to evaporate.
The way a warm air hand dryer works requires a large nozzle to be used. This slows the movement of the air to allow it to warm up sufficiently, however also has the drawback of exposing the fan to the exterior which allows noise to escape. The wide airflow also creates a great deal of turbulence in the surroundings, which amplifies the noise and allows it to spread.
Warm air – or evaporative hand dryers also work quite slowly. It can take more than thirty seconds for them to completely dry the user’s hands, which means that the loud noise is present for longer.