Table of Contents
Advertisement
UNIT SIZE
ALTITUDE (FT)
(BTUH)
40,000
60,000
80,000
0 to 2000
(0 to 610)
100,000
120,000
UNIT SIZE
ALTITUDE (FT)
(BTUH)
40,000
60,000
80,000
2001 to 3000
(610 to 914)
100,000
120,000
See notes at end of table.
Table 11 – Maximum Allowable Pipe Length --- Ft (M)
DIRECT VENT (2-PIPE) ONLY
TERMINATION
PIPE DIA
TYPE
IN. (mm)*
1 (25)
2 Pipe or 2-in
1-1/2 (38)
Concentric
2 (51)
1-1/2 (38)
2 Pipe or 2-in
Concentric
2 (51)
1-1/2 (38)
2 Pipe or 2-in
2 (51)
Concentric
2-1/2 (64)
2 (51)
2 Pipe or 3-in
2-1/2 (64)
Concentric
3 (76)
2-1/2 (64)
one disk
2 Pipe or 3-in.
3 (76)†
Concentric
3 (76) † no disk
DIRECT VENT (2-PIPE) ONLY
TERMINATION
PIPE DIA
TYPE
IN. (mm)*
1-1/2 (38)
2 Pipe or 2-in
Concentric
2 (51)
1-1/2 (38)
2 Pipe or 2-in
Concentric
2 (51)
2 (51)
2 Pipe or 2-in
Concentric
2-1/2 (64)
2-1/2 (64)
2 Pipe or 3-in
Concentric
3 (76)
3 (76)
NA
2 Pipe or 3-in.
Concentric
3 (76)† no disk
4 (102)† no
disk
NON-DIRECT
VENT (1-PIPE)
ONLY
PIPE DIA
1
IN. (mm)*
5
1 (25)
(1.5)
70
1-1/2 (38)
(21.3)
70
2 (51)
(21.3)
20
1-1/2 (38)
(6.1)
70
2 (51)
(21.3)
10
1-1/2 (38)
(3.0)
55
2 (51)
(16.8)
70
2-1/2 (64)
(21.3)
5
2 (51)
(1.5)
40
2-1/2 (64)
(12.2)
70
3 (76)
(21.3)
10
2-1/2 (64)
(3.0)
45
NA
(13.7)
70
3 (76)†
(21.3)
NON-DIRECT
VENT (1-PIPE)
ONLY
PIPE DIA
1
IN. (mm)*
67
1-1/2 (38)
(20.4)
70
2 (51)
(21.3)
17
1-1/2 (38)
(5.2)
70
2 (51)
(21.3)
49
2 (51)
(14.9)
70
2-1/2 (64)
(21.3)
35
2-1/2 (64)
(10.7)
70
3 (76)
(21.3)
14
NA
(4.3)
63
3 (76)†
(19.2)
70
NA
(21.3)
70
4 (102)† no disk
(21.3)
- - 38 - -
NUMBER OF 90° ELBOWS
2
3
4
5
NA
NA
NA
NA
70
65
60
60
(21.3)
(19.8)
(18.3)
(18.3)
70
70
70
70
(21.3)
(21.3)
(21.3)
(21.3)
15
10
5
NA
(4.6)
(3.0)
(1.5)
70
70
70
70
(21.3)
(21.3)
(21.3)
(21.3)
NA
NA
NA
NA
50
35
30
30
(15.2)
(10.7)
(9.1)
(9.1)
70
70
70
70
(21.3)
(21.3)
(21.3)
(21.3)
NA
NA
NA
NA
30
20
20
10
(9.1)
(6.1)
(6.1)
(3.0)
70
70
70
70
(21.3)
(21.3)
(21.3)
(21.3)
NA
NA
NA
NA
40
35
30
25
(12.2)
(10.7)
(9.1)
(7.6)
70
70
70
70
(21.3)
(21.3)
(21.3)
(21.3)
NUMBER OF 90° ELBOWS
2
3
4
5
62
57
52
52
(18.9)
(17.4)
(15.8)
(15.8)
70
70
70
70
(21.3)
(21.3)
(21.3)
(21.3)
12
7
NA
NA
(3.7)
(2.1)
67
66
61
61
(20.4)
(20.1)
(18.6)
(18.6)
44
30
25
25
(13.4)
(9.1)
(7.6)
(7.6)
70
70
70
70
(21.3)
(21.3)
(21.3)
(21.3)
26
16
16
6
(7.9)
(4.9)
(4.9)
(1.8)
70
70
70
66
(21.3)
(21.3)
(21.3)
(20.1)
9
NA
NA
NA
(2.7)
62
62
61
61
(18.9)
(18.9)
(18.6)
(18.6)
70
63
56
50
(21.3)
(19.2)
(17.1)
(15.2)
70
70
70
70
(21.3)
(21.3)
(21.3)
(21.3)
6
NA
55
(16.8)
70
(21.3)
NA
70
(21.3)
NA
20
(6.1)
70
(21.3)
NA
NA
70
(21.3)
NA
20
(6.1)
70
(21.3)
6
47
(14.3)
70
(21.3)
NA
61
(18.6)
15
(4.6)
70
(21.3)
NA
61
(18.6)
NA
61
(18.6)
43
(13.1)
70
(21.3)
Advertisement
Table of Contents
