Woodstock W1808 User Manual download pdf (Page 32)

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W1808/W1809/W1810 Cyclone Dust Collectors

OPERATIONS

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.

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Woodstock W1808 User Manual Page 32

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