Lennox ML193UH Installation Instructions Manual page 19

TYPICAL EXHAUST PIPE CONNECTIONS IN UPFLOW DIRECT OR
NON-DIRECT VENT APPLICATIONS
Pipe size determined in table 5
2"
EXHAUST
* 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.
TYPICAL EXHAUST PIPE CONNECTIONS IN HORIZONTAL DIRECT OR
NON-DIRECT VENT APPLICATIONS
(RIGHT HAND DISCHARGE SHOWN)
12" max.
2"
EXHAUST
* 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 24
3"
2"
or 2"
*2"
2"
2"
*2"
FIGURE 25
Page 19
3"
2"
TRANSITION
or
DO NOT transition
from smaller to larger
pipe in horizontal runs
of exhaust pipe.
45°
MAX
TRANSITION
SIDE VIEW
DO NOT transition
from smaller to larger
pipe in horizontal runs
of exhaust pipe.
*2"
45°
MAX