Lennox EL296UHE Series Unit Information page 26

Horizontal Installation Offset Requirements
Exhaust Pipe
12" Max.
Horizontal
Gas Furnace
NOTE -
ward unit. A minimum of 1/4" (6mm) drop for each 12" (305mm)
of horizontal run is mandatory for drainage.
NOTE - Exhaust pipe MUST be glued to furnace exhaust fitting,
unless the optional glueless vent adapter kit 17H92 is used..
NOTE - Exhaust piping should be checked carefully to make
sure there are no sags or low spots.
FIGURE 19
TABLE 16
MINIMUM VENT PIPE LENGTHS
EL296UHE MODEL
045, 070, 090, 110, 135
*Any approved termination may be added to the minimum length list-
ed. Two 45 degree elbows are equivalent to one 90 degree elbow.
12" Min.
MIN. VENT LENGTH*
15 ft. or 5 ft plus 2 elbows or
10 ft plus 1 elbow
1
2
3
4
5
6
7
Do not use screens or perforated metal in exhaust
or intake terminations. Doing so will cause freeze-
ups and may block the terminations.
Page 26
Piping Size Process
What is the
furnace capacity?
Which style termination
being used?
Standard or concentric?
.
Which needs
most elbows?
Intake or
exhaust?
How many elbows?
Count all elbows inside
and outside house.
Desired pipe size?
What is the altitude of
the furnace installation?
See max and min length
tables. Include all vent pipe
and elbows inside and
outside the hpouse
FIGURE 20
IMPORTANT