NOTE:
It is recommended that all pipes be cut, prepared, and
preassembled before permanently cementing any joint.
8. After pipes have been cut and preassembled, apply generous
layer of cement primer to pipe fitting socket and end of pipe
to insertion mark. Quickly apply approved cement to end of
pipe and fitting socket (over primer). Apply cement in a light,
uniform coat on inside of socket to prevent buildup of excess
cement. Apply second coat.
9. While cement is still wet, twist pipe into socket with 1/4 turn.
Be sure pipe is fully inserted into fitting socket.
10. Wipe excess cement from joint. A continuous bead of cement
will be visible around perimeter of a properly made joint.
11. Handle pipe joints carefully until cement sets.
12. Support combustion-air and vent piping a minimum of every
5 ft (3 ft for SDR-21 or -26 PVC) using perforated metal
hanging strap.
13. Slope combustion-air and vent pipes downward toward fur-
nace a minimum of 1/4-in. per linear ft with no sags between
hangers.
14. Use appropriate methods to seal openings where vent and
combustion-air pipes pass through roof or side wall.
CONCENTRIC VENT AND COMBUSTION-AIR
TERMINATION KIT INSTALLATION
NOTE:
If these instructions differ from those packaged with
termination kit, follow kit instructions.
Combustion-air and vent pipes must terminate outside structure. A
factory accessory termination kit must be installed in 1 of the
installations shown in Fig. 37, 38, 39, 40, and 41. Four termination
kits are available.
See Table 6 for additional termination information.
1. The 2-in. termination bracket kit is for 1-in., 1-1/2 in., and
2-in. diameter 2-pipe termination systems.
2. The 3-in. termination bracket kit is for 2-1/2 in., 3-in., and
4-in. diameter 2-pipe termination systems.
3. The 2-in. concentric vent/air termination kit is for 1-in., 1-1/2
in., 2-in., and 2-1/2 in. diameter pipe systems when single
penetration of wall or roof is desired.
4. The 3-in. concentric vent/air termination kit is for 2-1/2 in.,
3-in., and 4-in. diameter pipe systems when single penetration
of wall or roof is desired.
NOTE:
Shaded parts in Fig. 37, 38, 39, 40, and 41 are considered
to be termination. These components should NOT be counted
when determining pipe diameter. Roof termination is preferred
since it is less susceptible to damage, has reduced chances to take
in contaminants, and has less visible vent vapors. (See Fig. 37 or
38.) Sidewall termination may require sealing or shielding of
building surfaces with a corrosive resistance material due to
corrosive combustion products of vent system.
TABLE 7—MAXIMUM ALLOWABLE PIPE LENGTH (FT)
ALTITUDE (FT)
UNIT SIZE
TERMINATION
TYPE
PIPE DIA
(IN.)*
NUMBER OF 90° ELBOWS
1
2
3
4
5
6
0 to 2000
060–12
2 Pipe or 2-in
Concentric
1-1/2
20
15
10
5
NA
NA
2
70
70
70
70
70
70
080–12
080–16
2 Pipe or 2-in
Concentric
1-1/2
10
NA
NA
NA
NA
NA
2
55
50
35
30
30
20
2-1/2
70
70
70
70
70
70
100-16
100-20
2 Pipe or 3-in
Concentric
2
5
NA
NA
NA
NA
NA
2-1/2
40
30
20
20
10
NA
3
70
70
70
70
70
70
120-20
2 Pipe or 3-in.
Concentric
2-1/2 one disk
10
NA
NA
NA
NA
NA
3†
45
40
35
30
25
20
3† no disk
70
70
70
70
70
70
ALTITUDE (FT)
UNIT SIZE
TERMINATION
TYPE
PIPE DIA
(IN.)*
NUMBER OF 90° ELBOWS
1
2
3
4
5
6
2001 to 3000
060-12
2 Pipe or 2-in
Concentric
1–1/2
17
12
7
NA
NA
NA
2
70
67
66
61
61
61
080-12
080-16
2 Pipe or 2-in
Concentric
2
49
44
30
25
25
15
2-1/2
70
70
70
70
70
70
100-16
100-20
2 Pipe or 3-in
Concentric
2-1/2
35
26
16
16
6
NA
3
70
70
70
70
66
61
120-20
2 Pipe or 3-in.
Concentric
3
14
9
NA
NA
NA
NA
3† no disk
70
70
63
56
50
43
4† no disk
70
70
70
70
70
70
ALTITUDE (FT)
UNIT SIZE
TERMINATION
TYPE
PIPE DIA
(IN.)*
NUMBER OF 90° ELBOWS
1
2
3
4
5
6
3001 to 4000
060-12
2 Pipe or 2-in
Concentric
1-1/2
16
11
6
NA
NA
NA
2
68
63
62
57
57
56
080-12
080-16
2 Pipe or 2-in
Concentric
2
46
41
28
23
22
13
2-1/2
70
70
70
70
70
70
100-16
100-20
2 Pipe or 3-in
Concentric
2-1/2
33
24
15
14
5
NA
3
70
70
70
66
61
56
120-20
2 Pipe or 3-in.
Concentric
3† no disk
65
58
51
44
38
31
4† no disk
70
70
70
70
70
70
See notes at end of table.
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