507867-02P
Page 22 of 55
Issue 1933
Figure 28.
TYPICAL INTAKE PIPE CONNECTIONS IN HORIZONTAL DIRECT OR NON-DIRECT VENT
APPLICATION (RIGHT-HAND DISCHARGE SHOWN)
2”
2”
2”
2”
or
2”
AIR
INTAKE
TRANSITION
3”
*2”
*2”
TRANSITION
1-1/2”
**2”
**2”
or
* 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
See Figure 27 through Figure 30
This gas 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 and 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 transition solvent 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 in intake and
exhaust piping terminations for direct vent sections.
Figure 29.
