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Table8--1Vlaxirnum A llowableVent PipeLength(Ft) Continued
ALTITUDE
500t to 6000t
ALTITUDE
600t to 7000t
ALTITUDE
700t to 800Ot
ALTITUDE
800t to 9000?
UNiT SiZE
040-08
040-12
060-08
036060
060-16
080-12
080-16
080-20
100-16
100-20
120-20
UNiT SIZE
040-08
040-12
060-08
036060
060-16
080-12
080-16
080-20
100-16
100-20
120-20
UNIT SiZE
040-08
040-12
060-08
036060
060-16
080-12
080-16
080-20
100-16
100-20
120-20
UNIT SIZE
040-08
040-12
060-08
036060
060-16
080-12
080-16
080-20
100-16
100-20
120-20
VENT PIPE
DIAIVIETER (IN.)
1-1/2
2
1-1/2
2
2
2-1/2
2-1/2
3
3*
VENT PIPE
OIAIVIETER (IN.)
1-1/2
2
1-1/2
2
2
2-1/2
2-1/2
3
3*
VENT P_PE
OIAMETER
(IN.)
1-1/2
2
1-1/2
2
2
2-1/2
2-1/2
3
3*
VENT PIPE
DIAIVIETER (IN.)
1-1/2
2
1-1/2
2
2
2-1/2
2-1/2
3
3*
1
57
7O
14
6O
41
7O
29
7O
53
1
53
70
13
57
38
70
27
68
49
1
49
66
12
53
36
66
25
63
46
1
46
62
11
49
33
62
23
59
43
2
52
70
9
55
36
70
21
67
52
2
48
70
8
52
33
70
19
63
48
2
44
65
7
48
31
65
17
58
44
2
41
6O
6
44
28
6O
15
54
41
NUMBER
OF 90 °
3
47
70
NA
54
23
70
12
62
50
NUMBER
OF 90 °
3
43
68
NA
5O
21
68
10
58
47
NUMBER
OF 90 °
3
39
63
NA
46
19
63
8
53
43
NUMBER
OF 90°
3
36
58
NA
42
17
58
7
49
39
ELBOWS
4
42
70
NA
49
18
70
11
57
49
ELBOWS
4
38
67
NA
45
16
67
9
53
45
ELBOWS
4
34
62
NA
41
14
62
7
48
41
ELBOWS
4
31
58
NA
37
12
56
5
44
37
5
4O
7O
NA
48
17
7O
NA
52
48
5
37
66
NA
44
15
66
NA
48
44
5
33
60
NA
40
12
60
NA
43
40
5
29
55
NA
35
10
55
NA
39
35
6
35
7O
NA
47
8
7O
NA
47
47
6
32
64
NA
43
6
64
NA
43
43
6
28
59
NA
38
NA
59
NA
38
38
6
24
53
NA
34
NA
53
NA
34
34
Wide radius elbow
i- Vent sizing for Canadian
installations
over 4500 ft (1370 m) above sea level are subject to acceptance
by the local authorities
having jurisdiction.
NA--Not
Allowed
pressure switch will not make
NOTES:
1 Do not use pipe size greater than those specified
in table or incomplete
combustion,
flame disturbance,
or flame sense lockout may occur
2 Assume
two 45 ° elbows equal one 90 ° e@ow Long radius elbows are desirable and may be required in some cases. 3 Elbows and pipe sections within the furnace
casing and at the vent termination
should not be included in vent length or elbow count.
4 The minimum pipe length is 5 ft for all applications
26
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