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I-SCE (09-18) PN207697R9
VENTING AND COMBUSTION AIR—CONTINUED
Specific Venting Requirements: Support
Support horizontal runs every six feet (1.8 M). Support vertical runs of type “B” double-wall or Category III vent pipe
in accordance with the requirements of the pipe manufacturer. Support single-wall vertical pipe in accordance with
accepted industry practices. Do not rely on the heater or the adapter box for support of either horizontal or vertical
pipes. Use noncombustible supports on vent pipe.
NOTE: The double-wall vent terminal pipe does not attach to the concentric adapter box and
must be supported during installation.
Specific Venting Requirements: Clearance
Do not enclose the vent pipe or place pipe closer than 6 inches (152 mm) to combustible material.
Specific Venting Requirements: Concentric Adapter Box
The concentric adapter box (PN 205885) is included in the vent/combustion air kit. Installation instructions depend
on whether the vent system is horizontal (option CC6) or vertical (option CC2). All separated-combustion installations
require a concentric adapter box as shown in Figure 10.
Figure 10. Concentric Adapter Box
View of Heater Connection Side
View of Vent Terminal Connection Side
Collar for connecting
indoor portion of the
combustion air pipe
Opening for
double-wall vent
pipe to pass
through the box.
Collar for
attaching outside
concentric portion
of the combustion
air pipe
Concentric Adapter Box Airow
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