Circumventing An Obstacle
Wherever possible the branch lines should connect to
the trunk line in straight paths. The fewer turns in a tubing
system, the more efficient air flow. Accordingly, you
should locate the inlets to avoid zig-zags in the branch
lines. But, some-times, when you just can’t avoid an
obstacle, you are required to construct the tubing around
it.
In the example illustrated here, you might run the branch
line at an angle to avoid a chimney. Then, once the
branch line has run past the chimney, you can use a 45°
elbow to turn the branch line back perpendicular to the
trunk line. Again, the branch line and the trunk line con-
nect with a 90° Tee.
You can also use the supplied 36˝ piece of flexible tubing
to run a branch line around an obstacle. See “Using
Flexible Tubing,” on page 25.
Completing The Trunk Line
Continue to run the trunk line toward the power unit, con-
necting all branch lines as you go along. Again, make
sure you connect all fittings with the air flow toward the
power unit.
Bring the trunk line to the access hole you have drilled for
the power unit’s intake tube. Place a 90° elbow over the
hole and cut the trunk line to fit into this final elbow. Allow
5⁄8˝ of tubing to fit into the elbow’s collar. Connect the
elbow to the trunk line so that it aligns over the intake
access hole. You will make the intake tube
connection itself after you have installed the power unit.
When you are satisfied that all fittings and tubing are
aligned for maximum air flow, make sure that all your
cuts are square and that all joints are tight. Then, prepare
the tubing and cement the joints as described in
“Working With Plastic Tubing,” page 4.
28
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