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Min. Equiv.
Unit
Vent Length
070
090
15 ft.*
110
Table 6. Minimum Vent Pipe Lengths
NOTE: The exhaust collar on all models is sized to
accommodate 2" Schedule 40 vent pipe. Contact the
Application Department for more information concerning
sizing of vent systems which include multiple pipe sizes.
NOTE: If right side venting option is used, you must include
the elbow at the furnace in the elbow count. If transitioning
to 3" diameter pipe, this elbow equates to 20' of equivalent
vent length for all models.
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
fittings.
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 diameter.
Page 14 of 73
Example
5 ft. plus 2 elbows of 1-1/2",2",
2-1/2" or 3" diameter pipe
5 ft. plus 2 elbows of 2", 2-1/2
or 3" diameter pipe
5 ft. plus 2 elbows of 2-1/2"
or 3" diameter pipe
Furnace capacity?
1
Which termination?
2
Which needs most
3
elbows?
How many?
4
Desired pipe size?
5
What is the altitude?
6
Use Table 6 to find
7
max pipe length.
Issue 2241
070, 090,
110
Standard or
Concentric?
See Table 3
Intake or
Exhaust?
1-1/2", 2",
2-1/2"
or 3"
Figure 18.
507029-05
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