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INSTALLATION - VENTING
Section C - Horizontal 2-Pipe Vent Installation
C1. This section applies to horizontally vented 2-pipe vent
systems (one combustion air inlet pipe and one vent pipe) and
is in addition to "Section A - General Instructions - All Units".
C2. Horizontal vent systems terminate horizontally (sideways).
C3. Horizontal vents must be terminated with a Modine p/n:
• 5H072285-0001 (Item Code 27866) for 4" vent pipe
• 5H072285-0002 (Item Code 27868) for 6" vent pipe
The cap must terminate a minimum distance from the
external wall, as summarized in Figure 10.1.
C4. The termination of horizontally vented system must extend
12 inches beyond the exterior surface of an exterior wall.
C5. The combustion air pipe must be a minimum of 16 inches
below the vent pipe, and 24 inches from the exterior wall.
C6. Construct the vent system as shown in Figure 10.1.
Figure 10.1 - Horizontal 2-Pipe Venting
MUST USE THIMBLE
THROUGH WALL
24'' MIN.
TERMINAL
12''
ADJACENT
BUILDING
TERMINAL
16'' MIN.
24'' MIN.
COMBUSTION AIR
SUPPORT BRACKET
(See Fig. 9.2 for detail)
C7. When horizontal vents pass through a combustible wall (up
to 8 inches thick), the vent passage must be constructed
and insulated as shown in Figure 10.2.
C8. The vent must be supported as shown in Figure 10.2.
C9. When condensation may be a problem, the vent system
shall not terminate over public walkways or over an area
where condensate or vapor could create a nuisance or
hazard or could be detrimental to the operation of
regulators, relief openings, or other equipment.
Figure 10.2 - Exhaust Vent Construction Through
Combustible Walls and Support Bracket
C10. Maintain a 1/4" per foot downward slope away from the
heater and place a drip leg with clean out near the exit of
the vent as shown in Figure 10.1, or allow the condensate
to drip out the end.
C11. For a vent termination located under an eave, the
distance of the overhang must not exceed 24". The
clearance to combustibles above the exterior vent must
be maintained at a minimum of 12". Consult the National
Fuel Gas Code for additional requirements for eaves that
have ventilation openings.
C12. Once complete, proceed to section titled "Installation -
Gas Connections".
10
SUPPORT BRACKET
PITCH COMBUSTION AIR
(See Fig. 9.2 for detail)
PIPE DOWNWARD FROM
APPLIANCE 1/4" PER FOOT
EXHAUST
TEE WITH DRIP
LEG AND
CLEANOUT CAP
PITCH VENT PIPE DOWNWARD
AT LOW POINT
FROM APPLIANCE 1/4" PER FOOT
OF VENT SYSTEM
Section D - Concentric Vent System
Installation
The concentric vent adapter box must be installed inside of
the structure or building. Do not install this box on the exterior
of a building or structure.
D1. This section applies to both horizontally and vertically
vented concentric vent systems as defined in "Section A –
General Instructions – All Units", and is in addition to the
instructions in that section.
D2. When utilizing the concentric vent option, it should have
been predetermined whether the appliance will be
horizontally or vertically vented. Before proceeding, verify
that the concentric vent kit received contains the correct
components for the installation:
For Vertically Vented Units (Refer to Figure 10.3):
Model Size (Digits 4-6)
Kit Part Number
Kit Contents
Concentric Vent Adapter Box
Outlet Vent Termination Cap
Combustion Air Inlet Terminal 5H0751540004
Figure 10.3 - Vertical Concentric Vent Kit Components
Combustion Air
Inlet Terminal
Concentric
Vent Adapter
Box
Combustion Air
For Horizontally Vented Units (Refer to Figure 10.4):
Model Size (Digits 4-6)
Kit Part Number
Kit Contents
Concentric Vent Adapter Box
Outlet Vent Termination Cap
Combustion Air Inlet Guard
Figure 10.4 - Horizontal Concentric Vent Kit
Components
Concentric
Vent Adapter
Box
Combustion Air
Intake Guard
5-594.10
CAUTION
75-175
33356
(3H0349290003)
Part Number
3H0373840004
5H0722850001
Outlet Vent
Termination Cap
6" Min.
12" Min.*
Building
Roof / Ceiling
Exhaust
75-175
32161
(3H0349300003)
Part Number
3H0373840004
5H0751500001
3H0349320004
14" Min.
1" Min.
Building Side Wall
200-400
33357
(3H0349290004)
Part Number
3H0373840005
5H0722850002
5H0751540006
* Size according
to expected
snow depth.
200-400
32162
(3H0349300004)
Part Number
3H0373840005
5H0751500002
3H0349320006
Outlet Vent
Termination Cap
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