Page 42
TABLE 23
MINIMUM VENT PIPE LENGTHS
SLP99UHV
MODEL
MIN.EQUIV. VENT
LENGTH
EXAMPLE
070
15 ft*
5 ft. plus 2 elbows of
1-/12”, 2”, 2-1/2” or
3” diameter pipe
090, 110
5 ft. plus 2 elbows
of 2”, 2-1/2” or 3”
diameter pipe
*Any approved termination may be added to the minimum equivalent
length listed. Two 45 degree elbows are the equivalent to one 90 de-
gree elbow.
NOTE - It is acceptable to use any pipe size which ts
within the guidelines allowed in TABLE 24.
NOTE - The exhaust collar on all models is sized to ac-
commodate 2” Schedule 40 vent pipe. Contact the Appli-
cation Department for more information concerning sizing
of vent systems which include multiple pipe sizes.
NOTE - All horizontal runs of exhaust pipe must slope
back toward 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
ttings.
NOTE - Exhaust piping should be checked carefully to
make sure there are no sags or low spots.
Use the following steps to correctly size vent pipe diam-
eter.
IMPORTANT
Do not use screens or perforated metal in exhaust
or intake terminations. Doing so will cause freeze-
ups and may block the terminations.
Flue Coupling
The provided ue coupling must be attached to the ex-
haust coupling on the furnace top panel. Use provided
bands. See steps below and FIGURE 25.
1 - Remove the caution sticker from ue coupling .
2 - Fully insert ue coupling with both bands loosely
attached on the furnace exhaust coupling.
3 - Insert PVC exhaust pipe through ue coupling.
Ensure vent pipe is fully seated into exhaust
coupling. Tighten both top and bottom bands to 40
in lbs. See FIGURE 25. Do not use glue ue.
FIGURE 25
Piping Size Process
1
2
3
4
5
6
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?
Find max intake or
exhaust pipe length.
Includes all vent pipe and
elbows inside and outside
the house.
What is the altitude of
the furnace installation?
7
What is the
furnace capacity?
FIGURE 26
Furnace
Top Band
(torque to 40in-lbs)
PVC
Exhaust Pipe
Top Panel
Flue Coupling To Exhaust Coupling
Bottom Band
(torque to 40in-lbs)
Flue Couplig
Furnace
Exhaust Coupling
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