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17
COMBUSTION--AIR AND VENT PIPING FOR DIRECT VENT/2--PIPE (ALL SIZES)
Maximum Allowable Pipe Length (ft)
ALTITUDE
UNIT SIZE
(BTUH)
TERMINATION
TYPE
PIPE DIA (IN.)*
NUMBER OF 90
_
ELBOWS
1
2
3
4
5
6
0 to 2000
60,000
2---Pipe or 2---in.
Concentric
1---1/2
50
45
40
35
30
25
2
70
70
70
70
70
70
80,000
2---Pipe or 2---in.
Concentric
1---1/2
30
25
20
15
10
5
2
70
70
70
70
70
70
100,000
2---Pipe or 2---in.
Concentric
2
45
40
35
30
25
20
2---1/2
70
70
70
70
70
70
120,000
2 Pipe or 3---in.
Concentric
2---1/2
10
N/A
N/A
N/A
N/A
N/A
3 one disk
35
30
15
N/A
N/A
N/A
3
{
one disk
70
70
70
70
70
70
ALTITUDE
UNIT SIZE
(BTUH)
TERMINATION
TYPE
PIPE DIA (IN.)*
NUMBER OF 90
_
ELBOWS
1
2
3
4
5
6
2001 to 3000
60,000
2---Pipe or 2---in.
Concentric
1---1/2
45
40
35
30
25
20
2
70
70
70
70
70
70
80,000
2---Pipe or 2---in.
Concentric
1---1/2
26
21
16
11
6
N/A
2
70
70
70
70
70
70
100,000
2---Pipe or 2---in.
Concentric
2
40
35
30
25
20
15
2---1/2
70
70
70
70
70
70
120,000
2 Pipe or 3---in.
Concentric
3 one disk
31
26
12
N/A
N/A
N/A
3
{
one disk
63
62
62
61
61
61
ALTITUDE
UNIT SIZE
(BTUH)
TERMINATION
TYPE
PIPE DIA (IN.)*
NUMBER OF 90
_
ELBOWS
1
2
3
4
5
6
3001 to 4000
60,000
2---Pipe or 2---in.
Concentric
1---1/2
42
37
32
27
22
17
2
70
70
70
70
70
70
80,000
2---Pipe or 2---in.
Concentric
1---1/2
25
20
15
10
5
N/A
2
70
70
70
70
70
70
100,000
2---Pipe or 2---in.
Concentric
2
38
33
28
23
18
13
2---1/2
70
70
70
70
70
70
120,000
2 Pipe or 3---in.
Concentric
3 one disk
29
24
10
N/A
N/A
N/A
3
{
one disk
59
59
58
57
57
56
ALTITUDE
UNIT SIZE
(BTUH)
TERMINATION
TYPE
PIPE DIA (IN.)*
NUMBER OF 90
_
ELBOWS
1
2
3
4
5
6
4001 to 5000
}
60,000
2---Pipe or 2---in.
Concentric
1---1/2
40
35
30
25
20
15
2
70
70
70
70
70
70
80,000
2---Pipe or 2---in.
Concentric
1---1/2
23
18
13
8
N/A
N/A
2
70
70
70
70
70
68
100,000
2---Pipe or 2---in.
Concentric
2
36
31
26
21
16
11
2---1/2
70
70
70
70
70
70
120,000
2 Pipe or 3---in.
Concentric
3
{
one disk
56
55
54
53
52
52
ALTITUDE
UNIT SIZE
(BTUH)
TERMINATION
TYPE
PIPE DIA (IN.)*
NUMBER OF 90
_
ELBOWS
1
2
3
4
5
6
5001 to 6000
}
60,000
2---Pipe or 2---in.
Concentric
1---1/2
37
32
27
22
17
12
2
70
70
70
70
70
70
80,000
2---Pipe or 2---in.
Concentric
1---1/2
22
17
12
7
N/A
N/A
2
70
70
70
70
68
63
100,000
2---Pipe or 2---in.
Concentric
2
33
28
23
18
13
8
2---1/2
70
70
70
70
70
70
120,000
2 Pipe or 3---in.
Concentric
3
{
one disk
53
52
50
49
48
47
See notes on page 19.
58U
VB