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-20-
Model W1666/W1685 (For Machines Mfd. Since 2/15)
SETUP
Plastic duct generates
static electrical build-up
that can cause fire or
shock. Properly ground
all plastic duct to
reduce this risk.
Plastic.Duct
The popularity of plastic duct is due to the fact that it
is an economical and readily available product. It is also
simple to assemble and easily sealed against air loss. The
primary disadvantage of plastic duct for dust collection is
the inherent danger of static electrical build-up.
Metal.Duct
Advantages of metal duct is its conductivity, efficiency,
and that it does not contribute to static electrical charge
build-up. However, static charges are still produced when
dust particles strike other dust particles as they move
through the duct. Since metal duct is a conductor, it can
be grounded quite easily to dissipate any static electrical
charges.
There are a number of options when it comes to metal
duct, but metal duct that is specially manufactured
for dust collection is the best choice. When selecting
your metal duct, choose high quality metal duct with
smooth welded internal seams that will minimize airflow
resistance. This type of duct usually connects to other
ducts or elbows with a simple, self-sealing clamp, is very
quick and easy to assemble, and can be readily dismantled
and re-installed. This is especially important if you ever
need to change things around in your shop or add more
tools.
Avoid inferior metal duct that requires you to cut it to
length and snap it together. This type of duct is time
consuming to install because it requires you to seal all
the seams with silicone and screw the components on
the ends with sheet metal screws. Another disadvantage
is the rough internal seams and crimped ends that
unavoidably increase static pressure loss.
Figure.20. Examples of plastic duct
components (Model W1055).
Figure.21. Examples of metal duct
components.
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