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Table 13 – Vent Termination Kit for Direct Vent/2-Pipe System
DIRECT VENT (2-PIPE) TERMINATION KIT
TERMINATION SYSTEM
DIAM. OF COMBUSTION AIR AND VENT
PIPES --- IN (mm)
2-in. (51 mm) Concentric Vent Kit
Single Penetration of Wall or Roof
1, 1---1/2, 2, or 2---1/2 (25, 38, 51, 64 mm)
3-in. (76 mm)Concentric Vent Kit
Single Penetration of Wall or Roof
2---1/2, 3 or 4 (64, 76, 102 mm)
2-in. (51 mm)Termination Bracket Kit
2---Pipe Termination System
1, 1---1/2 or 2 (25, 38, 51mm)
3-in. (76 mm) Termination Bracket Kit
2---Pipe Termination System
2---1/2, 3 or 4 (64, 76, 102 mm)
EXAMPLE:
An 080--12 size furnace located in Indianapolis, elevation
650 ft (198 M) above sea level, could be installed as either a
direct vent/2-pipe system that requires 3 elbows and 32 ft
(9.8 M) of vent pipe, along with 5 elbows and 34 ft (10.4 M)
of combustion-air pipe OR a non-direct vent/1-pipe system
that requires 3 elbows and 32 (9.8 M) ft vent pipe.
For a direct vent/2-pipe system, Table 11 indicates this
application would allow a 2-in. (51 mm) diameter vent pipe,
but require a 2-1/2 in. (64 mm) diameter combustion air
pipe. According to Table 11, 2-in. (51 mm) diameter pipe is
good for 35 ft (10.7 M) with 3 elbows, but only 30 ft (9.1 M)
with 5 elbows. Therefore, 2-1/2 in. (64 mm) diameter pipe
must be used for both vent and combustion-air pipe since
larger required diameter must always be used for both pipes.
For a non-direct vent/1-pipe system, Table 11 indicates that
this application would allow a 2-in. (51 mm) diameter vent
pipe. If same installations were in Albuquerque, elevation
5250 ft (1600 M) above sea level:
For a direct vent/2-pipe system, Table 11 indicates that
2-1/2--in. (64 mm) diameter vent pipe and combustion-air
pipe are required.
For a non-direct vent/1-pipe system, Table 11 indicates that
2-1/2-in. (64 mm) diameter vent pipe is required.
If same applications are to be installed at 5001 to 6000 ft
(1524 to 1829 M) elevation:
For a direct vent/2-pipe system, 2-in. (51 mm) pipe is only
good for 23 ft (7.0 M) (with 3 elbows) and 17 ft (5.2
M)(with 5 elbows). Therefore, 2-1/2 in. (51 mm) diameter
combustion air and vent pipe must be used.
For a non-direct vent/1-pipe system, a 2-in. (51 mm)
diameter pipe is only good for 23 ft (7.0 M) with 3 elbows.
A 2-1/2-in. (64 mm) diameter vent pipe must be used.
VENT TERMINATION
General
Combustion-air (direct vent/2-pipe system only) and vent pipe
must terminate outside structure, either through sidewall or roof.
For vent termination clearance, refer to Table 8 for Direct
Vent/2-Pipe system and Table 9 for Non-direct Vent/1-Pipe
system. For exterior piping arrangements, refer to Fig. 42 for
Direct Vent/2-Pipe system and Fig. 43 for Non-Direct/
1-Pipe system.
Roof termination is preferred since it is less susceptible to
damage or contamination, and it has less visible vent vapors.
Sidewall termination require sealing or shielding of building
surfaces with a corrosive resistance material due to corrosive
combustion products of vent system.
NOTE
: (Direct Vent/2-Pipe system ONLY) A factory accessory
termination kit MUST be used. See section “Vent Termination Kit
(Direct Vent/2--Pipe System Only)” in this instruction.
When determining appropriate location for termination, consider
the following guidelines:
1. Comply with all clearance requirements stated in Table 8
or Table 9 per application.
2. Termination or termination kit should be positioned where
vent vapors will not damage plants/shrubs or air
conditioning equipment.
3. Termination or termination kit should be positioned so that
it will not be affected by wind eddy, such as inside
building corners, nor by recirculation of flue gases,
airborne leaves, or light snow.
4. Termination or termination kit should be positioned where
it will not be damaged by or subjected to foreign objects
such as stones, balls, etc.
5. Termination or termination kit should be positioned where
vent vapors are not objectionable.
Extended Exposed Sidewall Pipes
Sidewall combustion air pipe termination (direct vent/2-pipe
system only) and vent pipe termination may be extended beyond
area shown in Fig. 42 or in Fig. 43 per application in outside
ambient by insulating pipe as indicated in Table 10.
1. Determine
combustion
air
pipe
diameter
(direct
vent/2-pipe system only) and vent pipe diameter, as stated
above, using total pipe length and number of elbows.
2. Using winter design temperature (used in load
calculations), find appropriate temperature for your
application and furnace model.
3. Determine required insulation thickness for exposed
pipe length(s).
NOTE
: Pipe length (ft) specified for maximum pipe lengths
located in unconditioned spaces cannot exceed total allowable
pipe length as specified in Table 11.
Vent Termination Kit (Direct Vent/2-Pipe System Only)
NOTE
: Always refer to the instructions in termination kit for the
latest version.
Combustion air and vent pipes MUST terminate outside structure.
A factory accessory termination kit must be installed as shown in
Table 13. There are four options of vent/combustion air
termination kits available as shown in Table 13.
NOTE
: Combustion air pipe must have the same diameter as
vent pipe.
Concentric Vent/Combustion Air Termination Kit (Direct
Vent/ 2-Pipe System Only)
Determine an appropriate location for termination kit using the
guidelines provided in section “Vent Termination: General” in
this instruction.
1. 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.
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.
58MCB
