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SSCBL-RPBL-IOM (10-22) 149159-C
7 . Install inlet guard:
a . Position inlet guard over end of combustion air pipe in accordance with
b . Secure air inlet guard to inlet air pipe using four 1/2-inch-long screws provided .
NOTE: If vent pipe is inserted from outside, the exhaust cap may be attached before the double-wall
vent pipe is installed. If cap is attached first, ensure that the baffle strips are positioned correctly
when attaching the vent terminal pipe to the vent run (refer to step 8d below).
8 . Install double-wall terminal vent pipe:
NOTE: The length of the vent pipe is determined by the installation within maximum and minimum
requirements. The vent pipe extending through the box and the inlet air pipe must be one piece of
double-wall vent pipe without joints.
a . Refer to
to determine lengths of each pipe segment and to calculate total length required . Transi-
tion to single-wall or Category III vent pipe run must be made maximum of 6 inches (152 mm) from heater
side of box .
b . Ensure that double-wall terminal vent pipe is in proper direction and slide end of pipe through box . Position
pipe so that it will extend between 16–24 inches (406–610 mm) past end of combustion air pipe and no more
than 6 inches (152 mm) out of box toward heater .
NOTE: The double-wall vent pipe does not attach to the box. The installer must provide support.
c . Connect 5-inch double-wall vent pipe to 6- or 7-inch single-wall or Category III vent pipe run using tapered
) .
d . Ensure that exhaust cap is aligned so that its baffle strips are positioned on horizontal and vertical center lines
) . Install cap in accordance with
e . Ensure that double-wall section of vent pipe has slight downward drop of 1/4-inch per foot (6 mm per 305 mm)
toward vent terminal end .
f . Seal completely around circumference of pipe and opening of box using silicone sealant .
9 . Install indoor section of combustion air pipe:
a . Secure single-wall combustion air pipe run to collar on concentric adapter box using sheet metal screws . If
using 7-inch piping, install tapered enlarger as shown in
b . Seal pipe joints with tape or sealant .
10 . Verify compliance with
and with all specific venting requirements listed above .
Venting Connections (Model RPBL)
•
Locate power-vented furnaces so that flue discharge is not directed at fresh air inlets . The screened flue gas and
combustion air openings are located on the side of the furnace just above the control access panel (see
) .
The position of this opening discourages recirculation of combustion products and provides for furnace operation
in all normal weather conditions .
Figure 33. Flue Outlet and Combustion Air Inlet
