Carrier 58MTA - Page 31

Extended Exposed Sidewall Pipes
Sidewall combustion-air and vent pipe terminations may be
extended beyond area shown in Fig. 40 or 41 in outside ambient by
insulating pipes as indicated in Table 8.
1. Determine combustion-air and vent pipe diameters, as stated
above, using total pipe length and number of elbows.
2. Using winter design temperature (used in load calculations),
find appropriate temperature for your application and furnace
model.
3. Determine required insulation thickness for exposed pipe
lengths.
NOTE: Pipe length(ft) specified for maximum pipe lengths lo-
cated in unconditioned spaces. Pipes located in unconditioned
space cannot exceed total allowable pipe length as specified in
Table 7.
Two-Pipe Termination Kit
1. Determine location for termination. Consider the following
when determining an appropriate location for termination kit.
a. Comply with all clearance requirements as stated in Table
6.
b. Termination kit should be positioned where vent vapors
will not damage plants/shrubs or air conditioning equip-
ment.
c. Termination kit should be positioned so that it will not be
affected by wind eddy (such as inside building corners) or
allow recirculation of flue gases, airborne leaves, or light
snow.
d. Termination kit should be positioned where it will not be
damaged by or subjected to foreign objects, such as stones,
balls, etc.
e. Termination kit should be positioned where vent vapors are
not objectionable.
2. Cut 2 holes, 1 for each pipe, of appropriate size for pipe size
being used.
3. Loosely install elbow in bracket and place assembly on
combustion-air pipe.
TABLE 7—MAXIMUM ALLOWABLE PIPE LENGTH (FT) (Continued)
ALTITUDE (FT) UNIT SIZE
TERMINATION
TYPE
PIPE DIA
(IN.)*
NUMBER OF 90° ELBOWS
123456
4001 to 5000‡
060-12
2 Pipe or 2-in
Concentric
1-1/2 15 10 5 NA NA NA
2 645958535252
080-12
080-16
2 Pipe or 2-in
Concentric
2 443926212011
2-1/2 70 70 70 70 70 70
100-16
100-20
2 Pipe or 3-in
Concentric
2-1/2 31 22 13 12 NA NA
3 707067625752
120-20
2 Pipe or 3-in.
Concentric
3† no disk 53 46 40 33 26 20
4† no disk 70 70 70 70 70 70
ALTITUDE (FT) UNIT SIZE
TERMINATION
TYPE
PIPE DIA
(IN.)*
NUMBER OF 90° ELBOWS
123456
5001 to 6000‡
060-12
2 Pipe or 2-in
Concentric
1-1/2 14 9 NA NA NA NA
2 605554494847
080-12
080-16
2 Pipe or 2-in
Concentric
2 4136231817 8
2-1/2 70 70 70 70 70 70
100-16
100-20
2 Pipe or 3-in
Concentric
2-1/2 29 21 12 11 NA NA
3 706762575247
120-20
2 Pipe or 3-in.
Concentric
3† no disk 42 35 29 22 15 9
4† no disk 70 70 70 70 70 70
ALTITUDE (FT) UNIT SIZE
TERMINATION
TYPE
PIPE DIA
(IN.)*
NUMBER OF 90° ELBOWS
123456
6001 to 7000‡
060-12
2 Pipe or 2-in
Concentric
1-1/2 13 8 NA NA NA NA
2 575250454443
080-12
080-16
2 Pipe or 2-in
Concentric
2 3833211615 6
2-1/2 70 70 68 67 66 64
100-16
100-20
2 Pipe or 3-in
Concentric
2-1/2 27 19 10 9 NA NA
3 686358534843
120-20
2 Pipe or 3-in.
Concentric
3† no disk 31 24 18 11 NA NA
4† no disk 70 70 70 70 67 62
ALTITUDE (FT) UNIT SIZE
TERMINATION
TYPE
PIPE DIA
(IN.)*
NUMBER OF 90° ELBOWS
123456
7001 to 8000‡
060-12
2 Pipe or 2-in
Concentric
1-1/2 12 7 NA NA NA NA
2 534846414038
080-12
080-16
2 Pipe or 2-in
Concentric
2 3631191412NA
2-1/2 66 65 63 62 60 59
100-16
100-20
2 Pipe or 3-in
Concentric
2-1/2 25 17 8 7 NA NA
3 635853484338
120-20
2 Pipe or 3-in.
Concentric
3† no disk 20 13 7 NA NA NA
4† no disk 61 56 51 46 41 36
See notes at end of table.
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