Grizzly G0849, Owner'S Manual

Page: 34 / 56

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Model G0849 (Mfd. Since 01/19)
Figure 56. Additional factors affecting static
pressure.
Additional Factors Static Pressure
Seasoned (well used)
Dust Collection Filter
1"
Entry Loss at Large
Machine Hood
2"
Figure 57. Totaling static pressure numbers.
Main Line
6" Rigid Duct (0.037) at 20' ................ 0.740
Branch Line
4" Rigid Duct (0.075) at 10' ................ 0.750
4" Flexible Duct (0.28) at 5' ................ 1.400
Elbows/Branches
6" 45˚ Y-Branch ................................ 0.329
4" 45˚ Elbow ........................................ 0.225
Additional Factors
Seasoned Filter ................................ 1.000
Total Static Pressure Loss ................ 4.444
4. Total your list as shown in the example below
to come up with your overall static pressure
loss number for that line.
Note: Always account for a seasoned filter,
so you don't end up with a system that only
works right when the filter is clean.
Note: When calculating static pressure loss
to determine if multiple lines can be left open
at the same time, only include the main line
numbers once.
3. Add the additional factors from the following
table to your list.
5. Compare the total static pressure loss for that
line to the closest CFM given in Figure 57 for
your dust collector on
Page 33.
Example: A typical Data Sheet Performance
Curve is illustrated in Figure 58. Find 4.4 on
the Static Pressure axis (the amount of total
static pressure loss calculated in
Figure 57),
then refer to the closest value on the CFM
axis—approximately 1120 CFM.
The 1120 CFM for the static pressure loss of
the line connected to the router is well above
the 220 CFM requirement of that machine.
Figure 58. CFM for static pressure loss of line
connected to a dust collector & router.
— If the CFM for your static pressure loss
is above the requirement of the machine
connected to the end of that branch line,
then dust collection will most likely be
successful. Congratulations! You've just
designed your own dust system. Refer to
the
Accessories section on Page 37 to
start buying the components necessary to
make your system a reality.
— If the CFM for your static pressure loss
is below the requirement of the machine,
then that line will not effectively collect
the dust. You must then modify some of
the factors in that line to reduce the static
pressure loss. Some of the ways to do
this include 1) installing larger duct, 2)
reducing amount of flexible duct used,
3) increasing machine dust port size, 4)
moving machine closer to dust collector to
eliminate duct length, and 5) reducing 90˚
elbows or replacing them with 45˚ elbows.
Closest
CFM
(1120)
4.4 SP
Loss