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INSTALLATION - VENTING
C7. When horizontal vents pass through a combustible wall
(up to 22" thick), the vent passage must be constructed and
insulated as shown in Figure 9.1.
C8. The vent must be supported as shown in Figure 9.1.
Figure 9.1 - Exhaust Vent Construction Through
Combustible Walls and Support Bracket
METAL
SLEEVE
2" MIN.
VENT PIPE
DIAMETER
METAL FACE
METAL
SLEEVE
2" MIN.
1"
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.
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 8.2, 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 venting is complete, proceed to section titled
"Installation - Gas Connections".
Section D - Concentric Vent System Installation
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 9.2):
Concentric adapter assembly (same for horizontal and
vertical kits)
‚ Standard listed vent cap
ƒ Specially designed inlet terminal
For Horizontally Vented Units (Refer to Figure 9.3):
Concentric adapter assembly (same for horizontal and
vertical kits)
‚ Special vent termination cap
ƒ Special inlet air guard
FIBER GLASS
INSULATION
MIN. 2"
PLATE
1"
9"
VENT TERMINATION
45
SUPPORT BRACKET
9"
(where required)
(Make from 1" x 1" steel angle)
Figure 9.2 - Vertical Concentric Vent Kit Components
Combustion Air
Inlet Terminal
Concentric
Vent Adapter
Box
Combustion Air
Figure 9.3 - Horizontal Concentric Vent Kit
Components
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.
D3. Once the kit contents have been verified as correct for the
direction of venting, the concentric vent adapter box is to
be installed. Determine the location of the box. Be sure to
maintain all clearances as listed in these instructions.
D4. The adapter box is to be mounted on the interior side of
the building. It must not be mounted outside the building.
The adapter box has integral mounting holes for ease of
installation.
D5. The adapter box can be mounted flush to the wall (for
horizontal kits) or to the ceiling (for vertical kits). The box
can also be offset from the wall or ceiling by using field
supplied brackets. When mounting the box, consider
serviceability and access to the vent and combustion air
pipes. If the box is to be mounted using field supplied
brackets, these brackets must be strong enough to rigidly
secure the box to the wall or ceiling, and should be made
from corrosion resistant material.
D6. Determine the length of the vent pipe and combustion air
inlet pipe for the selected location. THE VENT PIPE WILL
PASS THROUGH THE CONCENTRIC VENT BOX. THE
LAST SECTION OF VENT PIPE IS A CONTINUOUS
LENGTH OF DOUBLE WALL "B" VENT. See section A12
for attaching and terminating double wall pipe. Begin with
pipe lengths on the concentric pipe side of the adapter box,
referring to Figure 10.1. These pipes will extend through the
building wall or roof as well as any added length for the
thickness of the wall and the offset from any field installed
brackets.
6-561.12
Outlet Vent
Termination Cap
6" Min.
* Size according
12" Min.*
Building
Roof / Ceiling
Exhaust
CAUTION
to expected
snow depth.
9
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