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9
6-561.2
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 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 Gary Steel 1092 vent termination
Specially designed inlet terminal (part #5H75154B1)
INSTALLATION - VENTING
Figure 9.1 - Exhaust Vent Construction Through
Combustible Walls and Support Bracket
Figure 9.2 - Vertical Concentric Vent Kit
Components
Combustion Air
Inlet Terminal
Outlet Vent
Termination Cap
Building
Roof / Ceiling
Concentric
Vent Adapter
Box
Combustion Air Exhaust
6" Min.
12" Min.*
* Size according
to expected
snow depth.
CAUTION
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.
For Horizontally Vented Units (Refer to Figure 9.3):
Concentric adapter assembly (same for horizontal and
vertical kits)
Special vent termination cap (part #5H75150B1)
Special inlet air guard
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.
For Vertical Concentric Vent Kits
(refer to Figure 9.2):
•Thebottomofthecombustionairintakepipemust
terminate above the snow line, or at least 12 inches
above the roof, whichever distance is greater.
•Thebottomoftheventcapmustterminateatleast6
inches above the top of the combustion air intake cap.
Figure 9.3 - Horizontal Concentric Vent Kit
Components