HP (Hewlett-Packard) 422690 I Furnace User Manual


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Page 10 Installer’s Information Manual
Table 2. Maximum Pipe Length--Non-Direct Vent
ALLOWABLE PIPE LENGTH (feet)
ALTITUDE FURNACE PIPE
NUMBER OF SWEEP ELBOWS (SEE NOTE 1)
INPUT DIA. 1 2 3 4 5 6 7 8
54,000
2"
112
108
104
100
96
92
88
84
72,000
2"
55
51
47
43
39
35
31
27
72,000
3"
150
150
150
150
150
150
150
150
0'
-
1000'
90,000
2"
36
32
28
24
20
16
-
-
90,000
3"
150
150
150
145
140
135
130
125
108,000
3"
85
80
75
70
65
60
55
50
126,000
3"
62
57
52
47
42
37
32
27
54,000
2"
97
93
90
86
83
80
76
73
72,000
2"
44
40
36
33
30
26
23
19
72,000
3"
150
150
150
150
150
150
150
150
1001'
-
2000'
90,000
2"
30
26
23
19
16
-
-
-
90,000
3"
140
135
130
125
120
115
110
105
108,000
3"
75
70
65
60
55
50
45
40
126,000
3"
50
45
40
35
30
25
20
15
54,000
2"
84
81
78
74
71
67
64
61
72,000
2"
37
34
30
27
24
21
18
15
72,000
3"
150
150
150
150
150
150
150
150
2001'
-
3000'
90,00
0
2"
24
21
18
14
11
-
-
-
90,000
3"
125
120
115
110
105
100
95
90
108,000
3"
50
45
40
35
30
25
20
15
126,000
3"
40
35
30
25
20
15
-
-
54,000
2"
71
68
64
61
58
55
51
48
72,000
2"
30
27
23
20
17
13
72,000
3"
150
150
150
150
150
150
150
15
0
3001'
-
4000'
90,000
2"
19
16
12
-
-
-
-
-
90,000
3"
100
95
90
85
80
75
70
65
108,000
3"
37
32
27
22
17
12
-
-
126,000
3"
30
25
20
15
10
-
-
-
126,000
3"
62
57
52
47
42
37
32
27
See Note 2
below.
54,000
2"
57
54
50
47
44
40
36
33
72,000
2"
25
22
19
16
12
-
-
-
72,000
3"
150
150
150
150
150
150
150
150
4001'
-
5000'
90,000
3"
85
80
75
70
65
60
55
50
108,000
3"
85
80
75
70
65
60
55
50
See Note 2
126,000
3"
62
57
52
47
42
37
32
27
54,000
2"
43
40
37
33
30
27
24
20
72,000
2"
21
18
14
11
-
-
-
-
72,000
3"
150
150
150
150
150
150
150
150
5001'
-
6000'
90,000
3"
70
65
60
55
50
45
40
35
108,000
3"
85
80
75
70
65
60
55
50
See Note 2
126,000
3"
62
57
52
47
42
37
32
27
54,000
2"
110
106
104
100
96
92
88
84
72
,000
2"
50
46
43
40
36
32
29
25
72,000
3"
150
150
150
150
150
150
150
150
6001'
-
7000'
90,000
3"
150
150
150
145
140
135
130
125
See Note 2
108,000
3"
85
80
75
70
65
60
55
50
126,000
3"
62
57
52
47
42
37
32
27
54,000
2"
97
93
90
86
83
80
76
73
72,000
2"
50
46
43
40
36
32
29
25
72,000
3"
150
150
150
150
150
150
150
150
7001'
-
8000'
90,000
3"
150
150
150
145
140
135
130
125
See Note 2
108,000
3"
85
80
75
70
65
60
55
50
126,000
3"
60
55
50
45
40
35
30
25
54,000
2"
84
81
78
74
71
67
64
61
72,000
2"
41
38
34
31
28
24
21
17
72,000
3"
150
150
150
150
150
150
150
150
8001'
-
9000'
90,000
3"
150
150
150
145
140
135
130
125
See Note 2
108,000
3"
70
65
60
55
50
45
40
35
126,000
3"
45
40
35
30
25
20
15
54,00
0
2"
71
68
64
61
58
55
51
48
72,000
2"
35
31
28
25
21
18
15
-
72,000
3"
150
150
150
150
150
150
150
150
9001'
-
10000'
90,000
3"
150
150
150
145
140
135
130
125
See Note 2
108,000
3"
55
50
45
40
35
30
25
20
126,000
3"
35
30
25
20
15
10
-
-
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.
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