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NOTE − The exhaust collar on all models is sized to ac-
commodate 2" Schedule 40 vent pipe. Contact the Ap-
plication 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
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.
IMPORTANT
Do not use screens or perforated metal in exhaust or
intake terminations. Doing so will cause freeze−ups
and may block the terminations.
1
2
3
4
5
6
Furnace
Capacity?
070, 090, 110
btuh
Which termination?
Standard or
Concentric?
See table 5
Intake or
exhaust?
Which needs
most elbows?
How many?
2", 2−1/2", 3"
Desired pipe size?
FIGURE 15
What is the altitude?
7
Use table 7 to find
max intake or
exhaust pipe length.