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Table 2. Maximum Pipe Length--Non-Direct Vent
ALTITUDE
FURNACE
INPUT
54,000
72,000
72,000
0'-1000'
90,000
90,000
108,000
126,000
54,000
72,000
72,000
1001'-2000'
90,000
90,000
108,000
126,000
54,000
72,000
72,000
2001'-3000'
90,000
90,000
108,000
126,000
54,000
72,000
72,000
3001'-4000'
90,000
90,000
108,000
126,000
126,000
54,000
72,000
72,000
4001'-5000'
90,000
108,000
126,000
54,000
72,000
72,000
5001'-6000'
90,000
108,000
126,000
54,000
72,000
72,000
6001'-7000'
90,000
108,000
126,000
54,000
72,000
72,000
7001'-8000'
90,000
108,000
126,000
54,000
72,000
72,000
8001'-9000'
90,000
108,000
126,000
54,000
72,000
72,000
9001'-10000'
90,000
108,000
126,000
NOTE 1: The table assumes the use of sweep elbows. If using hard 90? elbows, the vent length should be decreased an
additional 3 feet for every elbow used.
NOTE 2: The shaded portions of the table require the high altitude pressure switch in order to operate the furnace at the listed
vent lengths.
Page 14
ALLOWABLE PIPE LENGTH (feet)
PIPE
NUMBER OF SWEEP ELBOWS (SEE NOTE 1)
DIA.
1
2
2"
112
108
2"
55
51
3"
150
150
2"
36
32
3"
150
150
3"
85
80
3"
55
50
2"
97
93
2"
44
40
3"
150
150
2"
30
26
3"
140
135
3"
75
70
3"
45
40
2"
84
81
2"
37
34
3"
150
150
2"
24
21
3"
125
120
3"
50
45
3"
36
31
2"
71
68
2"
30
27
3"
150
150
2"
19
16
3"
100
95
3"
37
32
3"
30
25
3"
55
50
2"
57
54
2"
25
22
3"
150
150
3"
85
80
3"
85
80
3"
55
50
2"
43
40
2"
21
18
3"
150
150
3"
70
65
3"
85
80
3"
55
50
2"
110
106
2"
50
46
3"
150
150
3"
150
150
3"
85
80
3"
55
50
2"
97
93
2"
50
46
3"
150
150
3"
150
150
3"
85
80
3"
53
48
2"
84
81
2"
41
38
3"
150
150
3"
150
150
3"
70
65
3"
40
35
2"
71
68
2"
35
31
3"
150
150
3"
150
150
3"
55
50
3"
31
26
3
4
5
104
100
96
47
43
39
150
150
150
28
24
20
150
145
140
75
70
65
45
40
35
90
86
83
36
33
30
150
150
150
23
19
16
130
125
120
65
60
55
35
30
25
78
74
71
30
27
24
150
150
150
18
14
11
115
110
105
40
35
30
26
21
16
64
61
58
23
20
17
150
150
150
12
-
-
90
85
80
27
22
17
20
15
10
45
40
35
50
47
44
19
16
12
150
150
150
75
70
65
75
70
65
45
40
35
37
33
30
14
11
-
150
150
150
60
55
50
75
70
65
45
40
35
104
100
96
43
40
36
150
150
150
150
145
140
75
70
65
45
40
35
90
86
83
43
40
36
150
150
150
150
145
140
75
70
65
43
38
33
78
74
71
34
31
28
150
150
150
150
145
140
60
55
50
30
25
20
64
61
58
28
25
21
150
150
150
150
145
140
45
40
35
21
16
11
6
7
8
92
88
84
35
31
27
150
150
150
16
-
-
135
130
125
60
55
50
30
25
20
80
76
73
26
23
19
150
150
150
-
-
-
115
110
105
50
45
40
20
15
-
67
64
61
21
18
15
150
150
150
-
-
-
100
95
90
25
20
15
11
-
-
55
51
48
13
150
150
150
-
-
-
75
70
65
12
-
-
-
-
-
30
25
20
40
36
33
-
-
-
150
150
150
60
55
50
60
55
50
30
25
20
27
24
20
-
-
-
150
150
150
45
40
35
60
55
50
30
25
20
92
88
84
32
29
25
150
150
150
135
130
125
60
55
50
30
25
20
80
76
73
32
29
25
150
150
150
135
130
125
60
55
50
28
23
18
67
64
61
24
21
17
150
150
150
135
130
125
45
40
35
15
-
-
55
51
48
18
15
-
150
150
150
135
130
125
30
25
20
-
-
-
Installer's Information Manual
See Note 2
below.
See Note 2
See Note 2
See Note 2
See Note 2
See Note 2
See Note 2
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