Lennox EL297UH045XV36B Unit Information page 61

Use the following steps to correctly size vent pipe diam-
eter.
Piping Size Process
What is the
furnace capacity?
1
Which style termination
2
Standard or concentric?
Which needs
most elbows?
3
How many elbows?
Count all elbows inside
4
and outside house.
5 Desired pipe size?
What is the altitude of
6
the furnace installation?
See max and min length
tables. Include all vent pipe
7
and elbows inside and
outside the hpouse
FIGURE 22
being used?
.
Intake or
exhaust?
Do not use screens or perforated metal in exhaust or
intake terminations. Doing so will cause freeze-ups and
may block the terminations.
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IMPORTANT