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NOTE: Maximum Equivalent Vent Length (MEVL) includes standard and concentric vent termination and does NOT include elbows.
Use Table 18 - Deductions from Maximum Equivalent Vent Length to determine allowable vent length for each application.
Unit Size
40,000
Pipe Dia. (in) 1 ½
0--- 2000
20
2001--- 3000
15
3001--- 4000
4001--- 4500
Altitude
(feet)
4501--- 5000
10
5001--- 6000
6001--- 7000
5
7001--- 8000
8001--- 9000
N/A
9001--- 10000
Unit Size
40,000
Pipe Dia.
38
(mm)
0--- 610
6.0
25.9 56.3
611--- 914
24.3 53.3
4.5
915--- 1219
Altitude
1220--- 1370
21.3
(meters)
1371--- 1524
3.0
1525--- 1829
18.2 39.6
1830--- 2134
16.7 36.5
1.5
2135--- 2438
15.2 33.5
2439--- 2743
9.1
N/A
2744--- 3048
7.6
NOTES:
1. Inducer Outlet Restrictor disk (P/N 337683 ---401; 1.25 ---in. (32 mm) Dia.) shipped in the loose parts bag or available through Replacement Components
required under 10 ---ft. (3 M) TEVL in all orientations. Required for installations from 0 --- 2000 (0 to 610 M) above sea level. Failure to use an outlet restric-
tor may result in flame disturbances or flame sense lock ---out.
2. Inducer Outlet Restrictor disk (P/N 337683 ---401; 1.25 ---in. (32 mm) Dia.) available through Replacement Components required for no greater than 5 ---ft. (1.5
M) TEVL in downflow and horizontal orientations only. Required for installations from 0 --- 2000 (0 to 610 M) above sea level.
3. Inducer Outlet Restrictor disk (P/N 337683 ---402; 1.50 ---in. (38 mm) Dia.) available through Replacement Components required for no greater than 5 ---ft. (1.5
M) TEVL in downflow and horizontal orientations only. Required for installations from 0 --- 2000 (0 to 610 M) above sea level.
Long
Pipe Diameter (in):
Mitered 90º Elbow
Medium Radius 90º Elbow
Long Radius 90º Elbow
Mitered 45º Elbow
Medium Radius 45º Elbow
Long Radius 45º Elbow
Tee
NOTES:
1. Use only the smallest diameter pipe possible for venting. Over ---sizing may cause flame disturbance or excessive vent terminal icing or freeze ---up.
2. NA --- Not allowed. Pressure switch will not close, or flame disturbance may result.
3. Vent sizing for Canadian installations over 4500 ft. (1370 M) above sea level are subject to acceptance by the local authorities having jurisdiction.
4. Size both the combustion air and vent pipe independently, then use the larger size for both pipes.
5. Assume the two 45_ elbows equal one 90_ elbow. Wide radius elbows are desirable and may be required in some cases.
6. Elbow and pipe sections within the furnace casing and at the vent termination should not be included in vent length or elbow count.
7. The minimum pipe length is 5 ft. (2 M) linear feet (meters) for all applications.
8. Use 3 ---in. (76 mm) diameter vent termination kit for installations requiring 4 ---in. (102 mm) diameter pipe.
Table 17 – Maximum Equivalent Vent Length
Single Stage 92% --- Ft.
1
2
60,000
2
2 ½
1 ½
2
2 ½
85
185
100
175
200
20
80
175
95
165
185
160
16
90
155
175
70
155
85
170
150
145
15
80
165
60
130
75
140
155
55
120
13
70
130
145
50
110
10
65
120
135
30
95
5
60
115
125
25
85
N/A
55
105
115
Single Stage 92% --- Metric
1
2
60,000
51
64
38
5
64
76
30.4 53.3 60.9
6.0
28.9 50.2 56.3
48.7
4.8
27.4 47.2 53.3
47.2
25.9
51.8
45.7
44.1
4.5
24.3
50.2
22.8 42.6 47.2
3.9
21.3 39.6 44.1
3.0
19.8 36.5 41.1
28.9
1.5
18.2 35.0 38.1
25.9 N/A 16.7 32.0 35.0
ELBOW CONFIGURATIONS
Medium
Mitered
Table 18 – Deductions from Maximum Equivalent Vent Length - - Ft. (M)
1-1/2
8
(2.4)
5
(1.5)
3
(0.9)
4
(1.2)
2.5
(0.8)
2.5
1.5
(0.5)
1.5
16
(4.9)
16
80,000
3
1 ½
2
2 ½
3
4
15
55
130
175
200
125
165
185
49
115
155
175
10
150
165
44
110
145
160
41
100
135
150
38
125
140
90
36
120
125
N/A
33
80
110
115
30
75
100
105
80,000
38
51
64
76
102
4.5
16.7 39.6 53.3 60.9 6.0
38.1 50.2 56.3
14.9
35.0 47.2 53.3
3.0
33.5 45.7 50.2
13.4
0.0
44.1 48.7
12.4 30.4 41.1 45.7
11.5 27.4
.1
42.6
10.9
0.0
36.5 38.1
N/A
10.0 24.3 33.5 35.0
9.1
22.8 30.4 32.0
VENT TERMINAL CONFIGURATIONS
Concentric
2
2-1/2
8
(2.4)
8
(2.4)
5
(1.5)
5
(1.5)
3
(0.9)
3
(0.9)
4
(1.2)
4
(1.2)
(0.8)
2.5
(0.8)
(0.5)
1.5
(0.5)
(4.9)
16
(4.9)
50
3
100,000
120,000
2
2 ½
3
4
2 ½
20
80
175
200
10
165
185
15
75
175
5
155
70
170
150
165
10
65
140
155
60
135
145
N/A
55
125
135
N/A
50
115
125
45
100
115
3
100,000
120,000
51
64
76
102
64
24.3 53.3 60.9
22.8 56.3
3.0
22.8 50.2 56.3
21.3 53.3
4.5
0.0
53.3
1.5
19.8 50.2
47.2
21.3
51.8
19.8 45.7 50.2
18.2
3.0
0.0
42.6 47.2
18.2 41.1 44.1
N/A
15.2 42.6
16.7 38.1 41.1
14.0 39.6
N/A
15.2 35.0 38.1
13.1 36.5
13.7 30.4 35.0
11.8 35.0
Standard 2-in., 3-in., or
optional 4-in. termination.
3
8
(2.4)
8
5
(1.5)
5
3
(0.9)
3
4
(1.2)
4
2.5
(0.8)
2.5
1.5
(0.5)
1.5
16
(4.9)
16
3
3
4
75
185
70
175
65
165
160
60
155
50
140
46
130
43
120
39
115
3
76
102
48.7
47.2
A13110
4
(2.4)
(1.5)
(0.9)
(1.2)
(0.8)
(0.5)
(4.9)
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