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InsTAllATIon - venTIng
figure .1 - exhaust vent Construction Through
Combustible Walls and support Bracket
METAL
SLEEVE
2" MIN.
VENT PIPE
DIAMETER
METAL FACE
METAL
SLEEVE
2" MIN.
1"
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 .2):
➀ Concentric adapter assembly (same for horizontal and
vertical kits)
➁ Standard Gary Steel 1092 vent termination
➂ Specially designed inlet terminal (part #5H75154B1)
figure .2 - vertical Concentric vent Kit
Components
Combustion Air
Inlet Terminal
Concentric
Vent Adapter
Box
Combustion Air
FIBER GLASS
INSULATION
MIN. 2"
PLATE
1"
9"
VENT TERMINATION
45°
SUPPORT BRACKET
9"
(where required)
(Make from 1" x 1" steel angle)
Outlet Vent
Termination Cap
6" Min.
12" Min.*
* Size according
to expected
snow depth.
Building
Roof / Ceiling
Exhaust
for Horizontally vented units (refer to figure .3):
➀ Concentric adapter assembly (same for horizontal and
vertical kits)
➁ Special vent termination cap (part #5H75150B1)
➂ Special inlet air guard
figure .3 - Horizontal Concentric vent Kit
Components
Concentric
Vent Adapter
Box
Combustion Air
Intake Guard
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.
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.
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.
D6. 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. After determining the length of
the field supplied brackets, attach them to the sides of the
box using several corrosion resistant sheet metal screws.
See Figure 9.4 for typical installation and brackets.
figure .4 - Adapter Box with outlet vent
Pipe Attached
Field Supplied
Mounting Brackets
A
6-561
Outlet Vent
14" Min.
Termination Cap
1" Min.
Building Side Wall
Outlet Vent Pipe Attached
C
B
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