Lennox ML193UH030XE36B Installation Instructions Manual page 19

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"
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 25
(RIGHT HAND DISCHARGE SHOWN)
Exhaust
or 2"
2"
2"
2"
or
from smaller to larger
pipe in horizontal runs
2"
2"
Exhaust
3"
pipe in horizontal runs
*2"
*2"
FIGURE 26
Page 19
2"
2"
2"
or
TRANSITION
45°
MAX
DO NOT transition
SIDE VIEW
of exhaust pipe.
030/045/070 Only
DO NOT transition
1−1/2"
from larger to smaller
of exhaust pipe.
*2"
*2"
Exhaust
2"
030/045/070 Only
1−1/2"
2" 6" Min
Exhaust
45°
MAX
TRANSITION