Grizzly G0508, Owner'S Manual

Page: 21 / 45

-18-
G0508 10 HP Industrial Dust Collector
There are quite a number of options when it
comes to metal duct, but metal duct that is spe-
cially manufactured for dust collection is the best
choice. When selecting your metal duct, choose
high quality metal duct with smooth welded inter-
nal 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. See the
Accessories
section on
Page 25
for examples.
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 18. 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 19. Example of plastic duct and
components.