507868-01
Page 19 of 48
Issue 1912
Figure 24. Typical Intake Pipe Connections (Direct Vent Applications)
TYPICAL INTAKE PIPE CONNECTIONS
2”
Pipe size determined in table 7.
2”
2”
2”
2”
or
TOP VIEW
EXHAUST
INTAKE
TRANSITION
3”
*2”
*2”
TRANSITION
3”
*2”
**2”
1-1/2”
or
TRANSITION
* When transitioning up in pipe size, use the shortest length of 2” PVC pipe possible.
** When transitioning down in pipe size, use at least 1 foot of 2" PVC pipe.
NOTE
: Exhaust pipe and intake pipe must be the same diameter.
Intake Piping
This furnace may be installed in either direct vent or non-
direct vent applications. In non-direct vent applications,
when intake air will be drawn into the furnace from
the surrounding space, the indoor air quality must be
considered. Guidelines listed in Combustion, Dilution and
Ventilation Air section must be followed.
Follow the next two steps when installing the unit in Direct
Vent applications, where combustion air is taken from
outdoors and flue gases are discharged outdoors. The
provided air intake screen must not be used in direct vent
applications (outdoors).
1. Use cement or a sheet metal screw to secure the
intake pipe to the inlet air connector.
2. Route piping to outside of structure. Continue with
installation following instructions given in general
guide lines for piping terminations and intake and
exhaust piping terminations for direct vent sections.
Refer to Table 7A and Table 7B for pipe sizes.
Figure 25. Typical Air Intake Pipe Connections
Non-Direct Vent Applications
