Hand Dryers Information
Hand dryers are electric-powered appliances that dry hands after they have been washed. Most hand dryers consist of an apparatus with a downward-facing vent, under which wet hands are placed. Some newer, hands-in dryers consist of an opening to insert hands inside the air flow, drying hands from both sides.
Two major dryer types are hot-air and high-speed air. Hot-air dryers use relatively slow hot air to dry hands. High-speed air types use a burst of high-speed air to wick water off of hands and are typically more efficient than hot-air dryers, and also eliminates the need to rub hands together.
Hand dryers are primarily used for their cost savings and environmental impact. They generate no waste, and user fewer resources than paper towel dispensers. Hand dryers also use fewer resources to manufacture than paper towel manufacturing.
Hand dryers are typically turned on by a button or, in newer models, an infrared motion sensor. Once activated, a heating element heats the air that is then blown onto the user's hands.
The hygenic impact of hand dryers is debatable. Some studies comparing the hygiene of hand dryers to paper towels have shown that the effect on bacterial count actually increases with hand dryers and decreases with paper towels. Additional studies also indicate that cross contamination may occur to other users as far as two meters away. These claims have been called into question by hand dryer manufacturers and others.
Hand dryer manufacture.
Video credit: Discover Science Channel; Discovery Communications, LLC
Mike Mozart / CC BY 2.0 | Public domain