Hygiene
If a hand dryer doesn't have the NSF logo on it, it's not
certified hygienic.
NSF International, leading independent public health specialists, agree that the Dyson Airblade™ hand dryer is the only hygienic hand dryer and the first to meet NSF Protocol P335.
Dirty air in, clean air out
A HEPA filter removes 99.9% of bacteria from the air used to dry hands. To illustrate how this works, we set up a special test in a ‘smokebox’ to show how the HEPA filter in the Dyson Airblade™ hand dryer removes bacteria from the airflow. This ensures the air that dries your hands is hygienically clean.
View the HEPA filtration test to see the demonstration.
No hand rubbing
Users don't need to rub their hands together. Bacteria in lower skin layers are therefore not brought to the surface.
Speed of drying
The Dyson Airblade™ hand dryer takes just 10 seconds to dry hands. Wet hands can pick up and transfer up to 1,000 times more bacteria than dry hands.
Anti-microbial coating
External surfaces are infused with anti-microbial additives to reduce surface bacteria by 99.9% and lower the possibility of user contamination.
What is NSF Protocol P335?
The lengths we go to (and this is only one test!)The protocol sets out the standards a hand dryer must meet to be considered hygienic.
The criteria for a hygienic hand dryer include:
- Air filtration – Dust and bacteria must be removed from the air used to dry hands.
- Unheated air – The air used shouldn’t be heated up. Warming moist bacteria can increase their reproduction rate. Warm or hot air can remove beneficial oils from the skin.
- Drying time – Hands must be dried in 15 seconds or under. Damp hands pick up and transfer up to 1,000 times more bacteria than dry hands.
- Touch-free operation – The hand dryer must start and stop automatically.
Only the Dyson Airblade™ hand dryer meets all these criteria for a hygienic hand dryer.
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The protocol sets out the standards a hand dryer must meet to be considered hygienic.
The candidates
Take 3 male and 3 female candidates.
Weigh clean paper towel
Fold paper towel once, place on digital scales and record weight.
Wet hands
Place both hands in water container up to level of wrist crease for 5 seconds. Rub hands in the water to remove air traps and bubbles.
Drip
Remove hands from container and let water drip from hands for 5 seconds.
Position hands
Place hands under dryer 5cm from outlet.
*Dry hands according to manufacturer's instructions. If these instructions include rubbing then rub hands at a rate of 2 times per 5 seconds
Dry hands
Once air begins to flow from dryer begin to rub and dry hands. Start drying process by rubbing palms together twice.
Roll hands
Continue drying process by rolling hands twice.
Interlock hands
Continue drying process by interlocking and unlocking hands twice.
Remove excess moisture
Remove excess water from hands (between fingers and wrist) with paper towel until hands feel dry. Roll towel into a ball and place on scales within 5 seconds.
Re-weigh towel
Re-weigh the towel and record the weight.
Calculate the results
Repeat the test for all 6 candidates and calculate the mean dry time of the six tests.
If the re-weighed towel has 0.1g or less of moisture the product passes based on the NSF test hand drying time of 15 seconds.
Anything over 0.1g of moisture means the product will be deemed a failure.
