Grizzly Model G8027 - Manual (Page 17)

G8027 1 HP Dust Collector -15-
General
The Model G8027 is designed to be a single-
machine dust collector. Locate the dust collec-
tor where it will not interfere with the workpiece
being processed, and no more than 10' of ducting
is used, otherwise the CFM will be reduced. To
solve dust collection questions, Grizzly offers a
guide book entitled Dust Collection Basics that
will help you design your system.
Whatever system you choose, always make sure
there are no open flames or pilot lights in the
same room as the dust collector. There is a risk
of explosion if dust is dispersed into the air.
Material Selection
You have many choices regarding dust collection
ducting, but flexible hose is the most common.
However, be aware that there is a fire or explo-
sion hazard if plastic duct material is used for
dust collection without being grounded against
static electrical charge build-up.
Plastic Flexible Duct
Flexible rubber hose, polyethylene, plastic flex-
hose and other flexible ribbed hose is generally
used for short runs, small shops, and at rigid
duct-to-tool connections. There are many differ-
ent types of flex hose on the market today. These
are manufactured from materials such as poly-
ethylene, PVC, cloth hose dipped in rubber and
even metal, including steel and aluminum.
There are also many kinds of pure plastic flex-
ible 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.
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
Collection System 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 saw-
dust, since it is durable and completely flexible.
Polyethylene is also very economical and avail-
able in a wide variety of diameters and lengths for
most applications.
Duct Grounding
Plastic flex-hose is an insulator, and dust particles
moving against the walls of the hose creates a
static electrical build up. This charge will build
until it discharges to a ground. If a grounding
medium is not available to prevent static electrical
build up, the electrical charge will arc to the near-
est grounded source. This electrical discharge
may cause an explosion and subsequent fire
inside the system.
To protect against static electrical build up inside
a non-conducting duct, a bare copper wire should
be placed inside the duct along its length and
grounded to the dust collector. You must also
confirm that the dust collector is continuously
grounded through the electrical circuit to the elec-
tric service panel.
Always guard against
static electrical build up
by grounding all dust
collection lines.
Be sure that you extend the bare copper wire
down all branches of the system. Do not forget
to connect the wires to each other with wire nuts
when two branches meet at a “Y” or “T” connec-
tion.