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NOTE: Maximum Equivalent Vent Length (MEVL) includes standard and concentric vent termination and does NOT include elbows.
Use Table 17 - 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
4501--- 5000
10
(feet)
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
611--- 914
4.5
915--- 1219
1220--- 1370
Altitude
(meters)
1371--- 1524
3.0
1525--- 1829
1830--- 2134
1.5
2135--- 2438
2439--- 2743
N/A
2744--- 3048
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.
ELBOW CONFIGURATIONS
Long
Medium
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.
440 01 4541 00
Table 16 – Maximum Equivalent Vent Length
Single Stage 92% --- Ft.
1
2
60,000
2
2 ½
1 ½
2
2 ½
85
185
100
175
20
80
175
95
165
160
16
90
155
70
155
85
150
145
15
80
60
130
75
140
55
120
13
70
130
50
110
10
65
120
30
95
5
60
115
25
85
N/A
55
105
Single Stage 92% --- Meters
1
2
60,000
51
64
38
5
64
25.9 56.3
30.4 53.3 60.9
6.0
24.3 53.3
28.9 50.2 56.3
48.7
4.8
27.4 47.2 53.3
21.3
47.2
25.9
45.7
44.1
4.5
24.3
18.2 39.6
22.8 42.6 47.2
16.7 36.5
3.9
21.3 39.6 44.1
15.2 33.5
3.0
19.8 36.5 41.1
9.1
28.9
1.5
18.2 35.0 38.1
7.6
25.9 N/A 16.7 32.0 35.0
Mitered
Table 17 – 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)
1.5
(0.5)
16
(4.9)
Specifications subject to change without notice.
80,000
3
1 ½
2
2 ½
3
200
15
55
130
175
185
125
165
49
175
115
155
170
10
150
44
110
165
145
155
41
100
135
145
38
125
90
135
36
120
N/A
125
33
80
110
115
30
75
100
80,000
76
38
51
64
76
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
51.8
3.0
33.5 45.7 50.2
13.4
50.2
0.0
44.1 48.7
12.4 30.4 41.1 45.7
11.5 27.4
.1
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
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
100,000
4
2
2 ½
3
4
200
20
80
175
200
185
165
185
15
75
175
175
155
165
70
170
160
150
165
10
65
150
140
155
140
60
135
145
125
55
125
135
115
N/A
50
115
125
105
45
100
115
3
100,000
102
51
64
76
102
24.3 53.3 60.9
22.8 50.2 56.3
4.5
0.0
53.3
47.2
21.3
51.8
19.8 45.7 50.2
3.0
0.0
42.6 47.2
42.6
18.2 41.1 44.1
16.7 38.1 41.1
N/A
15.2 35.0 38.1
13.7 30.4 35.0
Standard 2-in., 3-in., or
optional 4-in. termination.
3
(2.4)
8
(2.4)
(1.5)
5
(1.5)
(0.9)
3
(0.9)
(1.2)
4
(1.2)
(0.8)
2.5
(0.8)
(0.5)
1.5
(0.5)
(4.9)
16
(4.9)
3
120,000
2 ½
3
4
75
185
10
70
175
5
65
165
160
60
155
N/A
50
140
46
130
43
120
39
115
3
120,000
64
76
102
22.8 56.3
3.0
21.3 53.3
1.5
19.8 50.2
48.7
18.2
47.2
N/A
15.2 42.6
14.0 39.6
13.1 36.5
11.8 35.0
A13110
4
8
(2.4)
5
(1.5)
3
(0.9)
4
(1.2)
2.5
(0.8)
1.5
(0.5)
16
(4.9)
53
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