Table of Contents
Advertisement
NOTE: All horizontal runs of exhaust pipe must slope back toward
unit. A minimum of 1/4" (6 mm) drop for each 12" (305 mm) 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 sages or low spots.
Figure 23. Exhaust Pipe
Horizontal Application
IMPORTANT
Do not use screens or perforated metal in exhaust or
intake terminations. Doing so will cause freeze-ups and
may block the terminations.
Capacity
045, 070, 090, 110, 135
*Any approved termination may be added to the minimum
length listed.
Table 4. Minimum Vent Pipe Lengths
Page 18 of 60
Min. Vent Length*
15 ft. or
5 ft. plus 2 elbows or
10 ft. plus 1 elbow
Issue 2332
Use the following steps to correctly size vent pipe diameter.
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.
Figure 24.
045, 070,
090, 110,
135 btuh
Standard or
Concentric?
See Table 3
Intake or
Exhaust?
1-1/2", 2",
2-1/2"
or 3"
508404-01
Advertisement
Table of Contents
