The only hand dryer
certified hygienic
32 33
When are dry hands dry?
Here’s how they test it.
Take three male and
female volunteers.
1
5
91011
2
6
3
7
4
8
Fold paper towel once,
place on digital scales
and record weight.
Place both hands in water
container up to level of wrist
crease for five seconds. Rub
hands in the water to remove
trapped air and bubbles.
Remove hands from container
and let water drip from hands
for five seconds.
Place hands under dryer 5 cm
from outlet. Dry hands according
to manufacturer’s instructions.
If these instructions include
rubbing then rub hands at a rate
of two times per five seconds.
Once air begins to flow from
dryer start to rub and dry
hands. Commence drying
process by rubbing palms
together twice.
Continue drying process
by rolling hands twice.
Continue drying process by
interlocking and unlocking
hands twice.
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 five seconds.
Re-weigh the towel
and record the weight.
Repeat the test for all six
volunteers and calculate the
mean dry time of the six tests.
The machine will be considered
‘hyg i e nic’ o n l y if the unit can
effectively dry hands to less than 0.1g
of residual m oisture within 15 se c o nds.
A ny thing over 0 .1g of m oist u re
means the product will be
deemed unhygienic.
<0.1g
>0.1g
Dyson Airblade Tap hand dryer
Air filtration
Air used to dry hands
must be HEPA filtered.
Unheated air
Warming moist bacteria increases
their reproduction rate. Heated air
can also remove beneficial oils
from the skin.
Drying time
Hands must be dried in under
15 seconds. NSF have defined
dry as 0.1g of residual moisture.
Damp hands can spread up
to 1,000 times more bacteria.
Touch-free operation
The hand dryer must start
and stop without user contact.
NSF certified
Dyson asked independent public
health specialists NSF to define the
criteria for a hygienic hand dryer.
The result is NSF Protocol P335 –
and Dyson Airblade
™
hand dryers
are the only hand dryers that
meet every part of it.
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