-+ 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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