However, it is important to acknowledge the potential issues with hand dryers. One primary concern is hygiene. A study in the Journal of Hospital Infection showed they could blow bacteria and viruses into the air, increasing the risk of cross-contamination.

A conventional hand dryer dries hands by warm air. The air speed is relatively low and so does the noise level. A high speed hand dryer dries hands by air speed. It literally blows water away. It uses less power as it focus on air speed rather than air temperature (heating element).

The infrared sensor or push button is what kicks off the entire hand-drying process. Sensors are activated by motion and a push button has to be pressed by the user. Either of these signals the hand dryer to start. The motor is activated once movement is detected.