Reznor SC Duct Furnace Unit Installation Manual - Manual (Page 12)

Form I-SC, P/N 207696 R11, Page 12
6.3 Venting and Combustion Air (cont'd)
Specific Venting Requirements (cont'd)
5) Support Support horizontal runs every six feet (1.8M). Support vertical runs of type "B" double-
wall or Category III vent pipe in accordance with the requirements of the pipe manufac-
turer. 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 non-combustible 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.
6) Clearance
All separated combustion installations require a concentric adapter box as illustrated
in FIGURE 8. The concentric adapter box is included in the vent/combustion air kit.
Installation instructions depend on whether the vent system is horizontal (Option CC6)
or vertical (Option CC2).
7) Concentric
Adapter Box
FIGURE 8 - A Concentric Adapter Box is a Required Part of all Model SC Installations
View of Heater Connection Side
View of Vent Terminal Connection Side
Concentric Adapter
Box Airflow
P/N 205885, Concentric Adapter Box
Top View
Heater Side View
6” Collar for
Combustion
Air Pipe
Opening for
vent pipe to
pass through
the box
2” (51mm)
2” (51mm)
6-1/32”
(153mm)
8” dia Collar for
Combustion Air
Pipe
14-1/4”
(362mm) 5”
(127mm)
5-7/32”
(133mm)
5-21/32”
(144mm)
diameter
5-9/32”
(134mm)
4”
(102mm)
13-3/8” (340mm)
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
Do not enclose the vent pipe or place pipe closer than 6" (152mm) to combustible
material.
6.0 Mechanical
(cont'd)
End View
showing
Airflow
Gray Arrows
show Flow of
Combustion Air
Vent (exhaust gas) flows through
field-supplied double-wall pipe
that extends straight through
the concentric adapter box.