Lennox A98USMV Installation Instructions Manual page 15

Exhaust
DO NOT transition
from larger to smaller
pipe in horizontal runs
of exhaust pipe.
TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN HORIZONTAL
508364-01
TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN UPFLOW
EXHAUST
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.
(RIGHT HAND DISCHARGE SHOWN)
12" max.
EXHAUST
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"
DO NOT transition
from smaller to larger
pipe in horizontal runs
of exhaust pipe.
Figure 18.
2"
Exhaust
or 2"
2"
2"
2"
or 2"
2"
2"
Exhaust
3"
*2"
*2"
Figure 19.
Issue 2346
2"
2"
2"
or
TRANSITION
Exhaust
45°
MAX
DO NOT transition
SIDE VIEW
from smaller to larger
pipe in horizontal runs
of exhaust pipe.
070 Only
DO NOT transition
from larger to smaller 1−1/2"
pipe in horizontal runs
of exhaust pipe.
*2"
*2"
Exhaust
2"
070 Only
1−1/2"
2" 6" Min
Exhaust
45°
MAX
TRANSITION
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