4b
) Drill a drain hole.
On the bottom side of the pipe, mark a location that
will be outside between the end of pipe and the building (about 2/3 of the
distance from the end of the pipe to the edge of the building) when the box
is installed. Drill a 1/2” diameter drain hole in the pipe at that location.
4c
) Attach the inlet air guard.
Position the inlet air ring guard over the end
of the combustion air pipe. See
FIGURE 16.
Attach the guard to the inlet air
pipe with the four 1/2” long screws provided.
5. Attach the concentric adapter box to the wall.
Insert the combustion air pipe with inlet guard attached out through the
wall. Position the box so that the pipe is centered in the opening. Attach the
brackets to the wall with field-supplied hardware.
6. Determine length and install the “terminal-end” vent pipe.
6a
) Determine length of pipe.
The length of the continuous piece of termi-
nal-end vent pipe is determined by the installation within the maximum and
minimum requirements. See
FIGURE 16
to determine lengths of each seg-
ment and calculate the total length required. The “terminal-end” vent pipe
extending through the box and concentric through the inlet air pipe must be
one piece of vent pipe without joints.
6b
) Drill a hole to attach the elbow at the end and install the pipe.
Being
sure the vent pipe is in the proper flow direction, temporarily fit the elbow
on the exhaust end of the vent pipe. For easier future service, the elbow is
being attached using one field-provided 3/4” long sheetmetal screw. Using
a drill that is a size smaller than the 3/4” long sheetmetal screw, with the
elbow pointing down, drill a pilot hole through the top center of the elbow
socket and the vent pipe.
Remove the elbow. In the elbow only, enlarge the drilled hole to 7/32”. The
elbow will be attached from the outside in Step 8b).
With the pipe turned so that the drilled hole is at the top, slide the end of
the vent pipe out through the box and the combustion air pipe. Position the
vent pipe so that it will extend between 3” (76mm) and 6” (152mm) past
the end of the combustion air pipe. Adjust the pipe so that the screw hole is
in the top center. Verify that the silicone sealing ring on the box is properly
seated.
Do not add sealant to the ring
.
Join the “terminal end” vent pipe to the vent pipe run. Re-check the silicone
ring to be sure that it is still properly seated.
7. Attach the indoor portion of the combustion air pipe.
Use sheet-
metal screws to attach the single-wall combustion air pipe run to the collar
on the concentric adapter box. Seal with tape or sealant.
8. On the outside, install the inlet air guard spacers, attach the elbow,
install the bird screen, and seal or flash around the combustion air
pipe.
8a)
Remove the screws holding the inlet air guard (installed in Step 4c).
Slide the spacers onto the ends of the four spokes that support the vent
pipe. Re-attach the guard.
8b)
Slide the elbow over the end of the vent pipe and attach it with the field-
provided 3/4” long sheetmetal screw. Slide the bird screen into the socket
on the open end of the elbow. The elbow must be pointing down.
7.2.2
HORIZONTAL VENT
TERMINAL Installation -
Option CC6 (cont’d)
7.2 Venting and
Combustion Air
(cont’d)
7. Mechanical
(cont’d)
Form I-UEAS, Page 22
