Lennox 97G2UHV Installation Instructions Manual page 22

Pipe size determined in Table 5
2"
Figure 25. Typical Exhaust Pipe Connections in Upflow Direct or Non-Direct Vent Applications
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.
Figure 26. Typical Exhaust Pipe Connections in Horizontal Direct or Non-Direct Vent Applications
Page 22 of 60
TYPICAL EXHAUST PIPE CONNECTIONS IN UPFLOW DIRECT OR
NON-DIRECT VENT APPLICATIONS
EXHAUST
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
* 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.
(Right Hand Discharge Shown)
2"
2"
2"
or
2"
or 2"
TRANSITION
2"
2"
EXHAUST
.
of exhaust pipe.
EXHAUST
Issue 2332
2"
3"
or
TRANSITION
*2"
045/070 Only
1-1/2"
TRANSITION
2"
or
3"
*2"
*2" 2"
EXHAUST
45°
MAX
6"
MINIMUM
NOTE: 1-1/2" Vent
Pipe Diameter Allowed
Only on 045/070 Units
1-1/2"
TRANSITION
2"
45°
MAX
SIDE VIEW
508404-01