Grizzly G1030Z2 - Manual (Page 26)

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Model G0562Z/ZP, G1030Z2/Z2P (Mfg. 11/11+)
determining main line duct size
the general rule of thumb for a main line duct is
that the velocity of the airflow must not fall below
3500 FpM.
For small/medium sized shops, using the inlet size
of the dust collector as the main line duct size
will usually keep the air velocity above 3500 FpM
and, depending on your system, will allow you to
keep multiple branches open at one time.
Mark your drawing as in figure 38, but using the
inlet size for your dust collector as the main line.
figure 38. Main line size labeled on sketch.
6'' 5''
4''
4''
4''
4''
4'' 4''
4''
determining branch line duct size
the general rule of thumb for a branch line duct is
that the velocity of the airflow must not fall below
4000 FpM.
For small/medium sized shops, using the dust
port size from the machine as the branch line duct
size will achieve the correct velocity in most appli-
cations. however, if the dust port on the machine
is smaller than 4", make the branch line 4" and
neck the line down right before the dust port.
note: Systems with powerful dust collectors work
better if multiple blast gates are left open. This
also allows you to run two machines at once.
Experiment with different combinations of blast
gates open/closed to find the best results for your
system.
Write your determined branch line sizes on your
drawing, as shown in
figure 39.
figure 39. Branch line sizes labeled on sketch.
6'' 5''
4''
4''
4''
4''
4'' 5''
4''
here are some frequently asked questions
when determining branch line sizes:
How do I figure which size of branch line to
use if the machine has two dust ports?
simply add the total CFM given for each size from
figure 35 and refer that CFM number to figure
40. then, split the branch line just before the dust
ports with matching duct sizes.
What if two machines share the same branch
line? you have two options:
1. if both machines will be running at
the same time, add the total CFM
given for each size from
figure 35
and match the branch line given in
figure 40.
2. if both the machines will never be
run at the same time, reference the
machine with biggest dust port to
figure 40 and add blast gates after
the y-branch to open/close the line
to each machine.
total cfm branch line size
400 4"
500 4"
600 5"
700 5"
800 6"
900 6"
1000 6"
figure 40. Branch line sizing chart by total CFM
(for use when multiple machines share line).