Lennox MERIT ML195UH Installation Instructions Manual page 21

TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN UPFLOW DIRECT OR
EXHAUST INTAKE
2"
2"
* When transitioning up in pipe size, use the shortest length of 2" PVC pipe possible.
TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN HORIZONTAL DIRECT OR NON-DIRECT VENT
EXHAUST
EXHAUST
* When transitioning up in pipe size, use the shortest length of 2" PVC pipe possible.
NON-DIRECT VENT APPLICATIONS
EXHAUST INTAKE
3"
3"
TRANSITION
*2"
*2"
FIGURE 24
APPLICATIONS
(RIGHT HAND DISCHARGE SHOWN)
12" max.
2"
or
2"
2"
2"
2"
INTAKE
3"
TRANSITION
*2"
*2"
*2"
INTAKE
FIGURE 25
Page 21
2"
TRANSITION
DO NOT transition
from smaller to larger
pipe in horizontal runs
of exhaust pipe.
2"
2"
2"
or
*2"
2"
2"
3"
*2"
2"
2"
2"
or
45° 45°
MAX MAX
SIDE VIEW
DO NOT transition
from smaller to larger
pipe in horizontal runs
of exhaust pipe.