Specifications

13. While cement is still wet, twist pipe into socket with
1/4-in. turn. Be sure pipe is fully inserted into fitting
socket.
14. Wipe excess cement from joint. A continuous bead of
cement will be visible around perimeter of a properly
made joint.
15. Handle pipe joints carefully until cement sets.
16. Horizontal portions of the venting system shall be
supported to prevent sagging. Support combustion air
piping and vent piping a minimum of every 5 ft. (1.5M) [3
ft. (.91M) for SDR-21 or -26 PVC] using perforated
metal hanging strap or commercially available hangars
designed to support plastic pipe.
17. Prevent condensate from accumulating in the pipes by
sloping the combustion air piping and vent piping
downward towards furnace a minimum of 1/4-in. per
linear ft. with no sags between hangers.
18. Complete the vent and combustion air pipe installation
by connecting to the concentric vent or by installing the
required termination elbows as shown in Figure 52 and
Figure 53, Alberta Figure 50 and Figure 51.
19. For ventilated combustion air terminations, refer to
Figure 53, Alberta Figure 50 and Figure 51.
20. Use appropriate methods to seal openings where
combustion air pipe and vent pipe pass through roof or
sidewall.
Optional Installation of the vent pipe
This option provides a disconnect point for the vent pipe. The
vent pipe must be cemented to the plastic vent pipe adapter to
maintain a sealed vestibule. See Figure 47 and Figure 48
1. Insert a length of vent pipe through the casing into the
outlet of the vent elbow.
2. Slide the plastic vent pipe adapter over the length of the
vent pipe down to the furnace casing. Mark the pipe
where it is flush with the outlet of the adapter.
3. Remove the pipe from the furnace and the adapter and
cut off any excess pipe.
4. Clean and prime the end of the pipe that is flush with the
vent adapter with a primer that is appropriate for the type
of pipe being used.
5. Re-insert the pipe through the casing into the vent
elbow.
6. Tighten the clamp around the outlet of the vent elbow.
Torque the clamp to 15 Ib-in.
7. Apply cement to the end of the pipe and to the inside of
the plastic vent adapter.
8. Slide the adapter over the vent pipe and align the screw
holes in the adapter with the dimples in the furnace
casing.
9. Pilot drill 1/8-in. screw holes for the adapter in the casing
and secure the adapter to the furnace with sheet metal
screws.
10. Loosen the clamps on the rubber vent coupling.
11. Slide the end of the coupling with notches in it over the
standoffs in the vent pipe adapter.
12. Tighten the clamp of the coupling over the vent pipe
adapter. Torque the lower clamp around the vent pipe
adapter to 15 Ib-in.
13. Pilot drill a 1/8-in. hole in the combustion air pipe
adapter.
14. Complete the vent and combustion air pipe as shown in
"Install the Vent and Combustion Air Pipe"
Installing the Vent Termination
Roof Terminations
A roof termination of any type will require a 4-in. (102 mm)
flashing for a 2-in. (51 mm) concentric vent or a 5-in. diameter
(127 mm) flashing for a 3-in. (76 mm) concentric vent kit. For
2-pipe or single pipe vent systems, a flashing for each pipe of
the required diameter will be necessary.
It is recommended that the flashing be installed by a roofer or
competent professional prior to installing the concentric vent.
The terminations can be installed on a flat or pitched roof.
Concentric Vent
Single or multiple concentric vent must be installed as shown in
Figure 52. Maintain the required separation distance between
vents or pairs of vents as shown in Figure 52 and all
clearance shown in Figure 59.
Cut one 4-in. (102 mm) diameter hole for 2-in. (51 mm) kit, or
one 5-in. (127 mm) diameter hole for 3-in. (76 mm) kit in the
desired location.
Loosely assemble concentric vent/combustion air termination
components together using instructions in kit.
Slide assembled kit with rain shield REMOVED through hole in
wall or roof flashing.
NOTE: Do not allow insulation or other materials to accumulate
inside of pipe assembly when installing it through hole.
Disassemble loose pipe fittings. Clean and cement using same
procedures as used for system piping.
2-Pipe Terminations
Two pipe vent must be installed as shown in Figure 52 and
Figure 53. Maintain the required separation distance between
vents or pairs of vents as shown in Figure 52 and Figure 53
and all clearance shown in Figure 59 or Figure 60.
Cut the required number of holes in the roof or sidewall for vent
and combustion air pipes. Sidewall holes for 2-pipe vent
terminations should be side-by-side, allowing space between
the pipes for the elbows to fit on the pipes.
Holes in the roof for two pipe terminations should be spaced no
more than 18-in. (457 mm) apart.
Termination elbows will be installed after the vent and (if used)
combustion air pipe is installed.
Sidewall Terminations
Concentric Vent Termination
Determine an appropriate location for termination kit using the
guidelines provided in section "Locating The Vent Termination"
in this instruction.
1. Cut one 4-in. diameter hole for 2-in. kit, or one 5-in.
diameter hole for 3-in. kit.
2. Loosely assemble concentric vent/combustion air
termination components together using instructions in kit.
3. Slide assembled kit with rain shield REMOVED through
hole.
NOTE: Do not allow insulation or other materials to accumulate
inside of pipe assembly when installing it through hole.
4. Locate assembly through sidewall with rain shield
positioned no more than 1-in. (25 mm) from wall as
shown in Figure 52.
5. Disassemble loose pipe fittings. Clean and cement using
same procedures as used for system piping.
Direct Vent (2-Pipe) Termination
Determine an appropriate location for termination kit using the
guidelines provided in section "Locating The Vent Termination"
in this instruction.
1. Cut two holes, one for each pipe, of appropriate size for
pipe size being used.
2. Loosely install elbow on combustion air and vent pipe
and place assembly on combustion-air pipe.
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