Woodstock PORTABLECYCLONE W1823 - Manual (Page 24)

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Model W1823 (Mfg. Since 9/10)
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Flexible Duct
Flexible hose is generally used for short runs, small shops
and at rigid duct-to-tool connections. There are many
different 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
completely 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
economical and available in a wide variety of diameters
and lengths for most applications.
Plastic Duct
The popularity of plastic duct ( Figure 28) 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.
Figure 27. Example of flexible metal duct.
Figure 28. Example of plastic duct and
components.