Grizzly G1028Z/G1029Z - Manual (Page 20)

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G1028Z/G1029Z Dust Collector
There are a number of options when it comes to
metal duct, but metal duct that is specially manu-
factured 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 espe-
cially 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.
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 for flexible ducting is metal
flex hose that is designed to be flexible and as
smooth as possible to reduce static pressure
loss.
Figure 15. Example of flexible metal duct.
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 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 offers greater
flexibility, but is non-resistant to abrasion and
tends to collapse in a negative pressure system.
We DO NOT recommend using dryer vent hose in
your dust collection system.
If using flex-hose, choose one of the many types
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. Grizzly offers polyethylene hose,
which is well suited for the removal of particulate
matter, especially sawdust, since it is durable and
completely flexible. Polyethylene is also very eco-
nomical and available in a wide variety of diam-
eters and lengths for most applications.
Plastic Duct
The popularity of plastic duct is due to the fact
that it is economical and readily available. 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 16. Example of plastic duct and
components.