Lennox Allied Air A93UH1E Installation Instructions Manual page 21

TYPICAL EXHAUST PIPE CONNECTIONS IN HORIZONTAL DIRECT OR NON-DIRECT VENT
DO NOT transition
from smaller to larger
pipe in horizontal runs
of exhaust pipe.
AIR
INTAKE
507867-02
APPLICATIONS (RIGHT-HAND DISCHARGE SHOWN)
12" max.
2"
EXHAUST
DO NOT transition
from larger to smaller
pipe in horizontal runs
of exhaust pipe.
* When transitioning up in pipe size, use the shortest length of 2" PVC pipe possible.
** When transitioning down in pipe size, use at least 1 foot of 2" PVC pipe.
NOTE: Exhaust pipe and intake pipe must be the same diameter.
TYPICAL INTAKE PIPE CONNECTIONS IN UPFLOW DIRECT OR
NON-DIRECT VENT APPLICATIONS
2"
or
3"
TRANSITION
*2"
* When transitioning up in pipe size, use the shortest length of 2" PVC pipe possible.
** When transitioning down in pipe size, use at least 1 foot of 2" PVC pipe.
NOTE: Exhaust pipe and intake pipe must be the same diameter.
2"
or 2"
TRANSITION
2"
2"
*2"
EXHAUST
.
EXHAUST
Figure 26.
Pipe size determined in Table 5
1-1/2"
or
TRANSITION
**2"
2"
2"
2"
or
Figure 27.
Issue 1922
or
3"
*2"
**2"
EXHAUST
45°
MAX
SIDE VIEW
2"
NOTE: 1-1/2" Vent
Pipe Diameter Allowed
Only on 030/045/070
Units
1-1/2"
TRANSITION
**2"
45°
MAX
Page 21 of 55