Lennox ELITE EL297UH070XV36B Installation Instructions Manual page 22

TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN UPFLOW
EXHAUST
Exhaust
DO NOT transition
from larger to smaller
pipe in horizontal runs
of exhaust pipe.
TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN HORIZONTAL DIRECT OR
DIRECT OR NON-DIRECT VENT APPLICATIONS
EXHAUST
INTAKE
2"
2"
3"
* 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.
NON-DIRECT VENT APPLICATIONS
12" max.
2"
or
EXHAUST
2"
2"
2"
INTAKE
3"
*2"
EXHAUST
*2"
INTAKE
* 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.
INTAKE
3"
Exhaust
DO NOT transition
from smaller to larger
pipe in horizontal runs
of exhaust pipe.
Figure 24
(RIGHT HAND DISCHARGE SHOWN)
Exhaust
2"
2"
2"
DO NOT transition
or 2"
from smaller to larger
pipe in horizontal runs
of exhaust pipe.
2"
2"
Exhaust
3"
DO NOT transition
from larger to smaller
pipe in horizontal runs
*2" of exhaust pipe.
*2"
Exhaust
Figure 25
Page 22
2"
2"
2"
or
045/070 Only
TRANSITION
45° 45°
MAX MAX
SIDE VIEW
045/070 Only
1−1/2"
TRANSITION
*2"
*2"
2"
1−1/2"
2" 6" Min
Exhaust