Woodstock SHOP FOX W1687 - Manual (Page 26)

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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 the following figure, but
using the inlet size for your dust collector as the main
line.
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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 right before the dust
port.
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Write your determined branch line sizes on your drawing,
as shown in the following figure.
If two machines will connect to the same branch line and
both will operate at the same time, then add the required
CFM for each machine together and find the closest
total CFM in the provided table to determine the correct
branch size.
If both machines will never run at the same time,
reference the machine with the biggest dust port in the
provided table and add blast gates after the Y-branch to
open/close the line to each machine.
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600 5"
700 5"
800 6"
1000 6"
1200 7"
1400 8"
1600 8"