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R-CAST SERIES WALL FURNACE
(Vertical Termination Continued.)
3. To bypass any overhead obstructions, the vent
system may be offset using a 45° elbow or a 90°
elbow. Vent stabilizers have straps for securing
these parts to joists or rafters. Plumbers tape may be
purchased locally and used in conjunction with vent
stabilizers. See Figure 9.
To install the Round Support Box/Wall Thimble in a
flat ceiling, cut a 10-inch square hole in the ceiling,
centered on the hole drilled in Step 2. Frame the
hole.
The SLD-Series Direct Vent Pipe is unitized and
twist-locks together. For the twist-lock procedure,
consult Figure 5 and do the following:
a. Four [4] indentations, located on the female ends
of pipes and fittings, are designed to slide straight
onto the male ends of adjacent pipes and fittings, by
orienting the four pipe indentations so they match
and slide into the four [4] entry slots on the male
ends. See Figure 5. Push the pipe sections com-
pletely together, then twist-lock one section clockwise
approximately one-quarter turn, until the two sections
are fully locked. The female locking lugs will not be
visible from the outside, on the Black Pipe or fittings.
They may be located by examining the inside of the
female ends.
12-99
Figure 9
Elbows with Stabilizer
Note: Be sure to provide intermediate sup-
port for the vent during construction and
check to be sure inadvertent loading has
not dislodged the vent from the heater or
any vent joint.
b. Horizontal runs of vent must be supported every
three feet. Wall Straps are available for this purpose.
Assemble the desired lengths of black pipe and
elbows. It is necessary to reach from the heater up
through the round support box. Ensure that all pipe
and elbow connections are in their fully twist lock
position.
Using the mark from Step 2, drive a nail up through
the roof to mark the center. Measure to either side of
the nail and mark the opening required. This is mea-
sured on the horizontal; actual length may be larger
depending on the pitch of the roof. Cut out and frame
the opening. See chapter 25 of the Uniform Building
Code for Roof Framing details. A one inch minimum
air space clearance must be maintained between the
vent system and the roof.
Assemble lengths of pipe and elbows necessary to
reach from the ceiling support box up through the
roof line. Galvanized pipe and elbows may be uti-
lized in the attic, as well as above the roof line. The
galvanized finish is desirable above the roof line due
to its higher corrosion resistance.
13
30750B
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