Table 11—Maximum Allowable Vent Pipe Length (Ft) for Non-Direct Vent Applications
Continued
For Use with 040 through 120 Size Furnaces Only
ALTITUDE
UNIT SIZE
VENT PIPE
DIAMETER
(IN.)*
NUMBER OF 90° ELBOWS
1
2
3
4
5
6
5001 to 6000‡
024040
036040
1-1/2
57
52
47
42
40
35
2
70
70
70
70
70
70
024060
036060
048060
1-1/2
14
9
NA
NA
NA
NA
2
60
55
54
49
48
47
036080
048080
060080
2
41
36
23
18
17
8
2-1/2
70
70
70
70
70
70
048100
060100
2-1/2
29
21
12
11
NA
NA
3
70
67
62
57
52
47
060120
3† no disk
42
35
29
22
15
9
4† no disk
70
70
70
70
70
70
Altitude
Unit Size
Vent Pipe
Diameter
(In.)*
Number of 90° Elbows
1
2
3
4
5
6
6001 to 7000‡
024040
036040
1-1/2
53
48
43
38
37
32
2
70
70
68
67
66
64
024060
036060
048060
1-1/2
13
8
NA
NA
NA
NA
2
57
52
50
45
44
43
036080
048080
060080
2
38
33
21
16
15
6
2-1/2
70
70
68
67
66
64
048100
060100
2-1/2
27
19
10
9
NA
NA
3
68
63
58
53
48
43
060120
3† no disk
31
24
18
11
NA
NA
4† no disk
70
70
70
70
67
62
Altitude
Unit Size
Vent Pipe
Diameter
(In.)*
Number of 90° Elbows
1
2
3
4
5
6
7001 to 8000‡
024040
036040
1-1/2
49
44
39
34
33
28
2
66
65
63
62
60
59
024060
036060
048060
1-1/2
12
7
NA
NA
NA
NA
2
53
48
46
41
40
38
036080
048080
060080
2
36
31
19
14
12
NA
2-1/2
66
65
63
62
60
59
048100
060100
2-1/2
25
17
8
7
NA
NA
3
63
58
53
48
43
38
060120
3† no disk
20
13
7
NA
NA
NA
4† no disk
61
56
51
46
41
36
Altitude
Unit Size
Vent Pipe
Diameter
(In.)*
Number of 90° Elbows
1
2
3
4
5
6
8001 to 9000‡
024040
036040
1-1/2
46
41
36
31
29
24
2
62
60
58
56
55
53
024060
036060
048060
1-1/2
11
6
NA
NA
NA
NA
2
49
44
42
37
35
34
036080
048080
060080
2
33
28
17
12
10
NA
2-1/2
62
60
58
56
55
53
048100
060100
2-1/2
23
15
7
5
NA
NA
3
59
54
49
44
39
34
060120
3† no disk
10
NA
NA
NA
NA
NA
4† no disk
35
30
25
20
15
10
See notes at end of table.
—50—
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