-26-
For Machines Mfd. Since 10/20
South Bend Tools
Model SB1100 & SB1101
S Y S T E M D E S I G N
Figure 41. CFM requirements labeled for each
machine.
Figure 40. Dust port size and quantity per average
machine.
Determine Required CFMs
Figure 39. Approximate required air flow for machine,
based on dust port size.
Since each machine produces a different amount
of sawdust, the requirements for the minimum
amount of CFM to move that sawdust is unique
to the machine (for example, a planer produces
more sawdust than a table saw). Knowing this
required CFM is important to gauging which size
of duct to use.
Refer to the figure below for a close estimation of
the airflow each machine requires. Keep in mind
that machines that generate the most sawdust
should be placed closest to the dust collector. If
the machine has multiple dust ports, the total
CFM required is the sum of all ports.
Machine
Dust Port Size
Approximate
Required CFM
2"
100
2.5"
150
3"
250
4"
400
5"
600
6"
850
7"
1200
8"
1600
9"
2000
10"
2500
If the machine does not have a built-in dust port,
use the following table to determine which size of
dust port to install.
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"
Write the required CFM for each machine on
your sketch, as shown in the figure below.
400
400
600
850
400
250
100
Table Saw
Planer/
Moulder
Miter
Saw
Jointer Sander
Planer
Shaper
Dust
Collector
4.
Gradual directional changes are more
efficient than sudden directional changes
(i.e. use the largest corner radius possible
when changing hose or pipe direction).
5.
Each individual branch line should have a
blast gate immediately after the branch to
control suction from one machine to another.
6.
The simpler the system, the more efficient
and less costly it will be.
