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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
40
2001 ---3000
35
3001 ---4000
30
4001 ---4500
25
Altitude
4501 ---5000
(feet)
5001 ---6000
20
6001 ---7000
15
7001 ---8000
10
8001 ---9000
9001 ---10000
5
Unit Size
40,000
Pipe Dia. (mm)
38
0 ---610
12.1
47.2
611 ---914
10.6
45.7
915 ---1219
9.1
41.1
1220 ---1370
39.6
7.6
Altitude
1371 ---1524
38.1
(meters)
1525 ---1829
6.0
36.5
1830 ---2134
4.5
33.5
2135 ---2438
30.4
3.0
2439 ---2743
27.4
2744 ---3048
1.5
24.3
NOTE:
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. (3.0 M) TEVL in all orientations. Required for installations from 0 ---2000 ft. (0 to 610 M)above sea level. Failure to use outlet restrictor on
40K model when required may result in flame disturbance or flame sense lockout.
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 ft. (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 ft. (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
Concentric Vent Termination
Standard Vent Termination
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 16 – Maximum Equivalent Vent Length - - Ft./In.
1
2
60,000
2
2 ½
1 ½
2
2 ½
155
185
100
175
20
150
175
95
165
135
160
16
90
155
130
155
85
150
125
145
15
80
145
120
130
75
140
110
120
13
70
130
100
110
10
65
120
90
95
5
60
115
80
85
N/A
55
105
Maximum Equivalent Vent Length --- Meters
1
2
60,000
51
64
38
51
64
56.3
6.0
30.4
53.3
60.9
53.3
0.0
28.9
50.2
56.3
48.7
4.8
27.4
47.2
53.3
47.2
25.9
45.7
51.8
44.1
4.5
24.3
44.1
50.2
39.6
22.8
42.6
47.2
36.5
3.9
21.3
39.6
44.1
33.5
3.0
19.8
36.5
41.1
28.9
1.5
18.2
35.0
38.1
25.9
NA
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)
2.5
1.5
(0.5)
1.5
16
(4.9)
16
NA
0
(0.0)
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
14.9
38.1
50.2
56.3
0.0
35.0
47.2
53.3
3.0
45.7
50.2
13.4
33.5
44.1
48.7
12.4
30.4
41.1
45.7
11.5
38.1
42.6
27.4
10.9
36.5
38.1
NA
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)
0
(0.0)
NA
0
(0.0)
0
(0.0)
49
3
100,000
4
2
2 ½
3
4
2 ½
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
N/A
125
55
125
135
115
N/A
50
115
125
105
45
100
115
3
100,000
102
51
64
76
102
6.0
24.3
53.3
60.9
50.2
56.3
4.5
22.8
53.3
47.2
21.3
51.8
45.7
50.2
3.0
19.8
42.6
47.2
18.2
41.1
44.1
16.7
38.1
41.1
NA
15.2
35.0
38.1
13.7
30.4
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
0
(0.0)
0
(0.0)
0
120,000
3
4
75
185
10
70
175
5
65
165
160
60
155
50
140
46
130
43
120
39
115
120,000
64
76
102
3.0
22.8
56.3
0.0
21.3
53.3
1.5
19.8
50.2
48.7
18.2
47.2
NA
15.2
42.6
14.0
39.6
13.1
36.5
11.8
35.0
A13110
4
(2.4)
(1.5)
(0.9)
(1.2)
(0.8)
(0.5)
(4.9)
NA
(0.0)
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