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-25-
Model W1666/W1685 (For Machines Mfd. Since 2/15)
SETUP
Write the required CFM for each machine on your sketch,
as shown in Figure.30.
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 shown in Figure.31, but using the
inlet size for your dust collector as the main line.
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 applications. 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.32.
395
395
614
790395
220
98
Table Saw
Planer/
Moulder
Miter
Saw
Jointer
Sander
PlanerShaper
Dust
Collector
Figure 30. CFM requirements labeled for
each machine.
395
395
614
790395
220
98
5" 6" 7"
Table Saw
Planer/
Moulder
Miter
Saw
Jointer Sander
PlanerShaper
Dust
Collector
Figure 31. Main line size labeled on
sketch.
395
395
614
790
395
220
98
4"
4"
4" 6"
4" 4" 5"
5" 6" 7"
Table Saw
Miter
Saw
Jointer Sander
PlanerShaper
Planer/
Moulder
Dust
Collector
Figure 32. Branch line duct sizes labeled.
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