Lennox ELITE Series Installation Instructions Manual page 21

TYPICAL EXHAUST PIPE CONNECTIONS AND CONDENSATE TRAP INSTALLATION
2"
* When transitioning up in pipe size, use the shortest length of 2" PVC pipe possible.
NOTE − Exhaust pipe and intake pipe must be the same diameter.
TYPICAL AIR INTAKE PIPE CONNECTIONS
2"
*2"
* When transitioning up in pipe size, use the shortest length of 2" PVC pipe possible.
NOTE − Intake pipe and exhaust pipe must be the same diameter.
2"
2"
3"
TRANSITION
*2"
FIGURE 26
2"
2"
TRANSITION
TRANSITION
*2"
3"
FIGURE 27
Page 21
DO NOT transition
from smaller to larger
pipe size in horizontal
runs of exhaust pipe.
Air Intake
3"
*2"
Air Intake
Exhaust
TOP VIEW
Exhaust
TOP VIEW