Once you have installed all your inlets, you can complete the
network of tubing that connects your inlets to the power unit.
This network consists of the following parts:
90° Elbows – Used for connecting the
inlet lines to the branch lines. Also used
for making smooth 90° turns in branch
lines or trunk lines.
45° Elbows – Used for a 45° tubing turn
in branch or trunk lines.
90° Tees – Used to connect branch
lines to the trunk lines.
Stop Couplings – Used to join two
lengths of tubing.
Flexible Tubing – Used to bypass
obstacles or to make difficult S-turns in
branch lines. This tubing is supplied in a
36” (914 mm) length; it is not the same
as the inlet flex tube.
PVC Tubing – 5’ (1.5 m) or 10’ (3 m)
straight sections of tubing used for inlet,
branch and trunk lines.
Use the tubing and fittings to run branch lines from the inlet
tubing to a main trunk line. Begin at the farthest inlet from the
power unit and work your way toward the power unit. When
you assemble sections with elbows and tees, make sure the
curve in the fitting is aligned so that the air flows toward the
power unit.
Assemble the entire network of tubing and fittings, making
sure every joint is accurately cut and aligned. Then, go back
and cement all the joints. You may run the wiring and make
the wiring connections after the network is assembled and
cemented, or you may make the wiring connections as you
assemble the network. Use the method that best suits
your needs.
Beginning the Trunk Line
Start the inlet line which is
farthest from the power
unit. Place 90° elbow
onto a section of tubing
and align it with the inlet
tubing at the height it will
run across the attic joists.
Mark the inlet tubing
where the elbow will join,
allowing 5/8” (16 mm) for
the tubing that inserts
into the fitting’s collar.
Now, cut the inlet tubing
at the marked line. Make
sure the cut is straight
and even. Attach the
elbow and check its fit.
Then, insert the first
section of tubing into the
other end of the elbow.
Joining Straight Lengths of Tubing
Both branch lines and the trunk lines may require lengths of
tubing longer than sections supplied. Use stop couplings to join
two straight lengths of tubing. Insert one end of the tubing
into the stop coupling; join the second length of tubing into
the other end of the stop coupling. Stop couplings are also
used to join long vertical branches which run from one level
to another level of a house.
page 15
TUBING SYSTEM ASSEMBLY
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