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Table 8--Maximum
Allowable
Vent Pipe Length (Ft)
ALTITUDE
0 to 2000
ALTITUDE
2001 to 3000
ALTITUDE
3001 to 4000
ALTITUDE
4001 to 5000t
UNiT SRZE
040-08
040-12
060-08
036060
060-16
080-12
080-16
080-20
100-16
100-20
120-20
UNiT SBZE
040-08
040-12
060-08
036060
060-16
080-12
080-16
080-20
100-16
100-20
120-20
UNiT SRZE
040-08
040-12
060-08
036060
060-16
080-12
080-16
080-20
100-16
100-20
120-20
UNiT SBZE
040-08
040-12
060-08
036060
060-16
080-I2
080-16
080-20
100-16
100-20
120-20
VENT PIPE
DIAMETER
(IN.)
1
1-1/2
2
1-1/2
2
1-1/2
2
2-1/2
2
2-1/2
3
2-1/2
3*
VENT PIP _=
DIAMETER
(iN.)
1-1/2
2
1-1/2
2
2
2-1/2
2-1/2
3
3*
VENT PIPE
DIAMETER
(iN.)
1-1/2
2
1-1/2
2
2
2-1/2
2-1/2
3
3*
VENT PIPE
DIAMETER
(iN.)
1-1/2
2
1-1/2
2
2
2-1/2
2-1/2
3
3*
NUMBER
1
2
3
5
NA
NA
70
70
65
70
70
70
20
15
10
70
70
70
10
NA
NA
55
50
35
70
70
70
5
NA
NA
40
30
20
70
70
70
10
NA
NA
70
70
70
NUMBER
1
2
3
67
62
57
70
70
70
17
12
7
70
67
66
49
44
30
70
70
70
35
26
16
70
70
70
63
62
62
NUMBER
I
2
3
64
59
54
70
70
70
16
11
6
68
63
62
46
41
28
70
70
70
33
24
15
70
70
70
59
59
58
NUMBER
I
2
3
60
55
50
70
70
70
15
10
5
64
59
58
44
39
26
70
70
70
31
22
13
70
70
67
56
55
54
OF 90 ° ELBOWS
4
5
NA
NA
60
60
70
70
5
NA
70
70
NA
NA
30
30
70
70
NA
NA
20
10
70
70
NA
NA
70
70
OF 00 ° ELBOWS
4
5
52
52
70
70
NA
NA
61
61
25
25
70
70
16
6
70
66
61
61
OF 00° ELBOWS
4
5
49
48
70
70
NA
NA
57
57
23
22
70
70
14
5
66
61
57
57
OF 00° ELBOWS
4
5
45
44
70
70
NA
NA
53
52
21
20
70
70
12
NA
62
57
53
52
6
NA
55
7O
NA
7O
NA
2O
7O
NA
NA
7O
NA
7O
6
47
70
NA
61
15
70
NA
61
61
6
43
70
NA
56
13
70
NA
56
56
6
39
70
NA
52
11
70
NA
52
52
* Wide radius elbow
? 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 ° elbow
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 fl for all applications
25
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