Use and Care Manual

• Figure 20 gives an example of the CFM for each
machine, the dust collector inlet size being used
as the main line and the determined branch
line size.
5. Determine the branch line duct size.
• The velocity of the airflow must not fall below
4000 CFM.
• In small to medium size shops make the branch
size the size of the machine's dust port size.
• If the machine's dust port size is smaller than 4"
make the branch line 4" and neck the line down at
the machine.
• Add the determined branch line sizes to
the sketch,
• If two machines will share a branch line and both
will operate at the same time, add the required
CFM for each machine together. See Table 3 and
find the closest CFM to determine the branch line
size required. If the machines will never run at
the same time use the machine with the largest
dust port to determine the required branch line
size. Add a Y-connector and blast gate to each
machine to open/close when needed.
TABLE 3
TOTAL CFM BRANCH LINE SIZE
400 4"
500 4"
600 5"
700 5"
800 6"
900 6"
1000 6"
6. Plan the drop downs for each machine.
• Use blast gates wherever possible to control the
air flow (Figure 21).
Figure 21
Rigid Pipe
Elbow
Y connector
Blast Gate
Flex Hose to
Machine
Rigid Pipe
(Main Line)
OPERATION
10
4 in.
branch line
6 in.
branch line
6 in.
branch line
Dust
Collector
4 in.
branch line
4 in.
branch line
Figure 20
Planer
884 CFM
Sander
790 CFM
Table
Saw
395
CFM
Miter
Saw
98
CFM
Jointer
395
CFM