Lennox Merit ML193UH

Page 20
FIGURE 26
TYPICAL AIR INTAKE PIPE CONNECTIONS IN UPFLOW DIRECT VENT APPLICATIONS
*2”
TRANSITION
2”
3”
Pipe size determined in table 5
2”
2”
2”
2”
or
AIR INTAKE
* When transitioning up in pipe size, use the shortest length of 2” PVC pipe possible.
NOTE − Intake and exhaust pipe must be the same diameter.
or
FIGURE 27
TYPICAL AIR INTAKE PIPE CONNECTIONS IN HORIZONTAL DIRECT VENT APPLICATIONS
(RIGHT HAND DISCHARGE SHOWN)
2”
2”
2”
2”
or
TRANSITION
3”
2”
AIR INTAKE
* When transitioning up in pipe size, use the shortest length of 2” PVC pipe possible.
NOTE − Intake and exhaust pipe must be the same diameter.
*2"
*2"