Lennox A97UH2E Installation Instructions Manual page 22

Pipe size determined in Table 5
2"
EXHAUST
TYPICAL EXHAUST PIPE CONNECTIONS IN HORIZONTAL DIRECT OR NON-DIRECT VENT
DO NOT transition
from smaller to larger
pipe in horizontal runs
of exhaust pipe.
Page 22 of 60
TYPICAL EXHAUST PIPE CONNECTIONS IN UPFLOW DIRECT OR
NON-DIRECT VENT APPLICATIONS
DO NOT transition
from smaller to larger
pipe in horizontal runs
of exhaust pipe.
* 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.
APPLICATIONS (RIGHT-HAND DISCHARGE SHOWN)
12" max.
2"
EXHAUST
DO NOT transition
from larger to smaller
pipe in horizontal runs
of exhaust pipe.
* 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.
2"
2"
2"
or
Figure 25.
2"
or 2"
TRANSITION
2"
2"
*2"
EXHAUST
.
EXHAUST
Figure 26.
Issue 2327
2"
3"
or
TRANSITION
*2"
030/045/070 Only
1-1/2"
TRANSITION
2"
6"
MINIMUM
or
3"
*2"
2"
EXHAUST
45°
MAX
SIDE VIEW
NOTE: 1-1/2" Vent
Pipe Diameter
Allowed Only on
030/045/070 Units
1-1/2"
TRANSITION
2"
45°
MAX
508390-01