BdYZa<%*)-O$<&%'-O'$<&%'.O'B[\#($%.
"(&"
Determining Main Line Duct Size
I]Z\ZcZgVagjaZd[i]jbW[dgVbV^ca^cZYjXi^h
i]Vii]ZkZadX^ind[i]ZV^g[adlbjhicdi[VaaWZadl
(*%%;EB#
;dg hbVaa$bZY^jb h^oZY h]deh! jh^c\ i]Z ^caZi
h^oZ d[ i]Z Yjhi XdaaZXidg Vh i]Z bV^c a^cZ YjXi
h^oZl^aajhjVaan`ZZei]ZV^gkZadX^inVWdkZ(*%%
;EB VcY! YZeZcY^c\dcndjg hnhiZb! l^aa Vaadl
ndjid`ZZebjai^eaZWgVcX]ZhdeZcVidcZi^bZ#
BVg`ndjgYgVl^c\Vh^cFigure 45!Wjijh^c\i]Z
^caZih^oZ[dgndjgYjhiXdaaZXidgVhi]ZbV^ca^cZ#
Figure 45. BV^ca^cZh^oZaVWZaZYdch`ZiX]#
+
*
)
)
)
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)
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Determining Branch Line Duct Size
I]Z\ZcZgVagjaZd[i]jbW[dgVWgVcX]a^cZYjXi^h
i]Vii]ZkZadX^ind[i]ZV^g[adlbjhicdi[VaaWZadl
)%%%;EB#
;dg hbVaa$bZY^jb h^oZY h]deh! jh^c\ i]Z Yjhi
edgih^oZ[gdbi]ZbVX]^cZVhi]ZWgVcX]a^cZYjXi
h^oZl^aaVX]^ZkZi]ZXdggZXikZadX^in^cbdhiVeea^"
XVi^dch#=dlZkZg!^[i]ZYjhiedgidci]ZbVX]^cZ
^h hbVaaZg i]Vc )! bV`Z i]Z WgVcX] a^cZ ) VcY
cZX`i]Za^cZYdlcg^\]iWZ[dgZi]ZYjhiedgi#
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.
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YgVl^c\!Vhh]dlc^cFigure 46#
Figure 46. 7gVcX]a^cZh^oZhaVWZaZYdch`ZiX]#
+
*
)
)
)
)
)
*
)
Here are some frequently asked questions
when determining branch line sizes:
How do I figure which size of branch line to
use if the machine has two dust ports?
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Figure 42VcYgZ[Zgidi]Vi8;BcjbWZgidFigure
47#I]Zc!hea^ii]ZWgVcX]a^cZ_jhiWZ[dgZi]ZYjhi
edgihl^i]bViX]^c\YjXih^oZh#
What if two machines share the same branch
line?
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1. >[Wdi]bVX]^cZhl^aaWZgjcc^c\Vii]ZhVbZ
i^bZ!VYY i]Z idiVa 8;B\^kZc [dg ZVX] h^oZ
[gdb Figure 42VcYbViX]i]ZWgVcX]a^cZ
\^kZc^cFigure 47#
2. >[Wdi]i]ZbVX]^cZhl^aacZkZgWZgjcVii]Z
hVbZ i^bZ! gZ[ZgZcXZ i]Z bVX]^cZ l^i] W^\"
\ZhiYjhiedgiidFigure 47VcYVYYWaVhi
\ViZh V[iZg i]Z N"WgVcX] id deZc$XadhZ i]Z
a^cZidZVX]bVX]^cZ#
Total CFM Branch Line Size
)%% )
*%% )
+%% *
,%% *
-%% +
.%% +
&%%% +
Figure 47. 7gVcX]a^cZh^o^c\X]VgiWnidiVa8;B
[dgjhZl]Zcbjai^eaZbVX]^cZhh]VgZa^cZ#