Lennox SIGNATURE SLP99UHV070XV36B Installation Instructions Manual page 19

TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN UPFLOW
EXHAUST
2"
Exhaust
DO NOT transition
from larger to smaller
pipe in horizontal runs
of exhaust pipe.
TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN HORIZONTAL
EXHAUST
EXHAUST
INTAKE
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.
FIGURE 23
(RIGHT HAND DISCHARGE SHOWN)
12" max.
2"
or
2"
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.
FIGURE 24
Page 19
INTAKE
2"
3"
Exhaust
DO NOT transition
from smaller to larger
pipe in horizontal runs
of exhaust pipe.
Exhaust
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
of exhaust pipe.
*2"
*2"
Exhaust
2"
2"
2"
or
070 Only
1−1/2"
TRANSITION
2" 6" Min
Exhaust
45° 45°
MAX MAX
SIDE VIEW
/070 Only
1−1/2"
TRANSITION
*2"
*2"