Lennox ELITE Series Installation Instructions Manual page 20

EXHAUST INTAKE
2"
2"
TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN HORIZONTAL DIRECT OR NON−DIRECT VENT
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TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN UPFLOW DIRECT OR
NON−DIRECT VENT APPLICATIONS
EXHAUST
3"
TRANSITION
*2"
* When transitioning up in pipe size, use the shortest length of 2" PVC pipe possible.
APPLICATIONS
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.
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INTAKE
3"
TRANSITION
*2"
pipe in horizontal runs
FIGURE 22
(RIGHT HAND DISCHARGE SHOWN)
2"
or 2"
2"
2"
or
2"
2"
2"
TRANSITION
3"
*2"
*2"
FIGURE 23
Page 20
2"
2"
2"
or
DO NOT transition
from smaller to larger
of exhaust pipe.
45°
MAX
2"
*2"
SIDE VIEW
DO NOT transition
from smaller to larger
pipe in horizontal runs
of exhaust pipe.
2"
45°
MAX