Grizzly G0671 - Manual (Page 31)

Model G0671/G0672/G0673 (Mfg. Since 1/13
-29-
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 26 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.
figure 26. approximate required airflow for
machines, based on dust port size.
Machine
Dust Port Size
approximate
Required CfM
2" 98
2.5" 150
3" 220
4" 395
5" 614
6" 884
7" 1203
8" 1570
9" 1990
10" 2456
if your machine does not have a built in dust port,
use
figure 27 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 27. dust port size and quantity per
average machine.
figure 28. CFM requirements labeled for each
machine.
395
395
614
790 395
220
98
Write the required CFM for each machine on your
sketch, as shown in
figure 28.