Woodstock SHOP FOX W1808 - Manual (Page 32)

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W1808/W1809/W1810 Cyclone Dust Collectors
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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 unavoid-
ably increase static pressure.
Flexible Duct
Flexible hose is generally used for short runs, small shops
and at rigid duct-to-tool connections. There are many dif-
ferent types of flex hose on the market today. These are
manufactured from materials such as polyethylene, PVC,
cloth hose dipped in rubber and even metal, including
steel and aluminum.
The superior choice here is metal flex hose that is
designed to be flexible, yet be as smooth as possible to
reduce static pressure loss.
There are also many kinds of pure plastic flexible hose,
such as non-perforated drainage type hose and dryer vent
hose. Drainage type hose, while being economical, does
not quite have the flexibility 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 complete-
ly flexible, is non-resistant to abrasion and has a tendency
to collapse in a negative pressure system. We DO NOT
recommend using dryer drainage-type vent hose in your
dust collection system.
If using flex-hose, you should choose one of the many
types that are designed specifically for the movement of
solid particles, i.e. dust, grains and plastics. However, the
cost of specifically designed flexible duct can vary greatly.
For example, polyethylene hose is well suited for the
removal of particulate matter, especially sawdust, since
it is durable and completely flexible. Also, it is very eco-
nomical and available in a wide variety of diameters and
lengths for most applications.
Plastic Duct
The popularity of plastic duct ( Figure 42) is due to the
fact that it is an economical and readily available prod-
uct. 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.
Figure 41. Example of flexible metal duct.
Figure 42. Example of plastic duct and
components.