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ASSEMBLY
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As shown in Figure 21, there are several differ-
ent options to choose from when deciding on a
duct material. Variables such as ease of use,
cost, availability, and your specific shop, all
play a part in determining the best option for
you.
METAL DUCT
Metal duct comes in many varieties. Stove pipe,
heating/ventilation duct and duct made espe-
cially for dust collection are all options.
Advantages of metal duct are its conductivity
and that it does not contribute to static electri-
cal 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. However, metal duct is gen-
erally more expensive than plastic duct and it is
not usually airtight unless specifically manufac-
tured for dust collection. Specially manufac-
tured metal duct, on the other hand, is quite
expensive. Metal duct is also generally more
difficult to cut and assemble.
FLEXIBLE HOSE
Flexible rubber hose, polyethylene, plastic
flex-hose and other flexible ribbed hose are
generally used for short runs, small shops and at
rigid duct-to-tool connections. Woodstock
offers a large variety of flexible hose with many
diameters and lengths to choose from. The fig-
ure below shows some options to consider.
There are also many kinds of pure plastic flexi-
ble hose, such as non-perforated drainage type
hose and dryer vent hose. Drainage type hose,
while being economical, does not have the flex-
ibility required for dust collection. The inside of
the duct is also deeply corrugated and can
increase the static pressure loss by as much as
50% over smooth wall duct. Dryer vent hose,
while being completely flexible, is non-resistant
to abrasion and has a tendency to collapse in a
negative pressure system.
Woodstock flex-hose is designed specifically for
the movement of solid particles, i.e. dust, grains
and plastics. It is well suited for the removal of
particulate matter, especially sawdust, since it
is durable and completely flexible.
RIGID 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, whether black
ABS or white PVC and even rubber or polyethyl-
ene flex-hose, is the inherent danger of static
electrical build-up.
See your local Woodstock Dealer for the Model
W1049 Dust Collection Separator shown in
Figure 22. The Model W1049 turns your dust col-
lector into a 2-stage collection system.
Material Selection
Accessories
Figure 22. Dust Collection Separator.
Largest Particles
Finest
Particles
Large and
Fine
Particles
Figure 21. Dust Collection Fittings.