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3.
Directional changes should be kept to a mini-
mum. The more directional change fittings
you use directly increases the overall resis-
tance to airflow.
4.
Gradual directional changes are more effi-
cient than sudden directional changes (i.e.
use the largest corner radius possible when
changing hose or pipe direction).
5.
Each branch line should have a blast gate
immediately after the branch to control suc-
tion from one machine to another.
6.
The simpler the system, the more efficient
and less costly it will be.
Step 4. Determine Required CFM of
Each Machine
Since each machine produces a different amount
of sawdust, the requirements for the minimum
amount of CFM needed to move that sawdust is
unique to the machine (for example, a planer pro-
duces more sawdust than a table saw). Knowing
this required CFM is important in gauging which
size of duct to use.
Figure 25 will give you a close estimation of the
airflow your machine requires. Machines that
generate the most sawdust should be placed near
the dust collector. If the machine has multiple
dust ports, the total CFM required is the sum of
all ports.
Machine
Dust Port Size
2"
2.5"
3"
4"
5"
6"
7"
8"
9"
10"
Figure 25. Approximate required airflow for
machines, based on dust port size.
-30-
Approximate
Required CFM
98
150
220
395
614
884
1203
1570
1990
2456
If your machine does not have a built in dust port,
use Figure 26 to determine the size of dust port
to install on your machine.
Machine
Average Dust Port Size
Table Saw ...................................................... 4"
Miter/Radial-Arm Saw ....................................2"
Jointer (6" and smaller) ................................. 4"
Jointer (8"-12") ............................................... 5"
Thickness Planer (13" and smaller) ............... 4"
Thickness Planer (14"-20") ............................6"
Shaper ........................................................... 4"
Router (mounted to table) ..............................2"
Bandsaw ........................................................ 4"
Lathe .............................................................. 4"
Disc Sander (12" and smaller) .......................2"
Disc Sander (13-18") ...................................... 4"
Belt Sander (6" and smaller) .........................2"
Belt Sander (7"-9") ........................................3"
Edge Sander (6" x 80" and smaller) .............. 4"
Edge Sander (6" x 80" and larger) ................ 5"
Drum Sander (24" and smaller) ............... 2 x 4"
Drum Sander (24" and larger) ................. 4 x 4"
Widebelt Sander (18" and smaller) ................ 5"
Widebelt Sander (24"–37" single head) ..2 x 6"
Widebelt Sander (24"_51" double head) . 5 x 4"
Figure 26. Dust port size and quantity per
average machine.
Write the required CFM for each machine on your
sketch, as shown in Figure 27.
395
98
220
395
Figure 27. CFM requirements labeled for each
machine.
Model G0671/G0672/G0673 (Mfd. Since 6/17)
790
395
614
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