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926SB: Installation, Start-up, Operating, Service and Maintenance Instructions
NOTE: Maximum Equivalent Vent Length (MEVL) includes standard and concentric vent termination and does NOT include elbows. Use
Deductions from Maximum Equivalent Vent Length to determine allowable vent length for each application.
Unit Size
40,000
Pipe Dia.
1 ½
2
(in)
0-2000
40
155
2001-3000
35
150
3001-4000
30
135
4001-4500
130
Altitude
25
(feet)
4501-5000
125
5001-6000
20
120
6001-7000
15
110
7001-8000
100
10
8001-9000
90
9001-10000
5
80
Unit Size
40,000
Pipe Dia.
38
51
(mm)
0-610
12.1
47.2
611-914
10.6
45.7
915-1219
9.1
41.1
1220-1370
39.6
Altitude
7.6
(meters)
1371-1524
38.1
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:
1.40K 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 ft. (0 to 610 M) above sea level. Failure to use an outlet restrictor may result in flame disturbances or flame sense
lock-out.
2.60K Inducer Outlet Restrictor disk (P/N 337683-401; 1.25-in. (32 mm) Dia. available through Replacement Components) required for less 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.
3.120K Inducer Outlet Restrictor disk (P/N 337683-402; 1.50-in. (38 mm) Dia. available through
horizontal orientations only. Required for installations from 0 - 2000 ft. (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
Concentric Vent Termination
Standard Vent Termination
NOTE:
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.
9.A running Tee in the Combustion Air Pipe adds 0 ft. to the TEVL of the vent length.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Table 15 – Maximum Equivalent Vent Length - Ft.
1
2
60,000
2 ½
1 ½
2 ½
1 ½
2
3
185
100
175
200
20
175
95
165
185
160
16
90
155
175
155
85
150
170
145
15
80
145
165
130
75
140
155
120
13
70
130
145
110
10
65
120
135
N/A
95
5
60
115
125
85
N/A
55
105
115
Maximum Equivalent Vent Length - Meters
1
2
60,000
64
38
51
64
76
56.3
30.4
53.3
60.9
4.5
6.0
53.3
28.9
50.2
56.3
48.7
4.8
27.4
47.2
53.3
47.2
25.9
45.7
51.8
3.0
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
ELBOW CONFIGURATIONS
Medium
Mitered
Table 16 – 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)
NA
0
(0.0)
80,000
2 ½
2
3
4
2
15
55
130
175
200
20
125
165
185
49
15
115
155
175
10
150
165
44
110
145
160
10
41
100
135
150
38
125
140
90
36
120
125
33
80
110
115
N/A
30
75
100
105
80,000
38
51
64
76
102
51
16.7 39.6
53.3
60.9
6.0
38.1
50.2
56.3
14.9
4.5
35.0
47.2
53.3
45.7
50.2
13.4 33.5
44.1
48.7
3.0
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
NA
9.1
22.8
30.4
32.0
Replacement
Components) required for less than 5-ft. (1.5 M) TEVL in downflow and
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
0
(0.0)
NA
0
(0.0)
0
40
3
100,000
120,000
2 ½
2 ½
3
4
3
4
80
175
200
75
185
10
165
185
70
175
75
175
5
65
165
155
70
170
160
150
165
60
65
140
155
155
60
135
145
N/A
50
140
55
125
135
46
130
50
115
125
43
120
45
100
115
39
115
3
100,000
120,000
64
76
102
64
76
102
24.3
53.3
60.9
22.8
56.3
3.0
50.2
56.3
21.3
53.3
22.8
53.3
1.5
19.8
50.2
47.2
21.3
51.8
48.7
45.7
50.2
18.2
19.8
42.6
47.2
47.2
18.2
41.1
44.1
NA
15.2
42.6
16.7
38.1
41.1
14.0
39.6
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
(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)
0
(0.0)
(0.0)
0
(0.0)
Table 16
-
3
140,000
2 ½
3
4
5
65
155
140
60
120
50
110
45
100
N/A
35
80
30
65
25
45
15
30
10
15
3
140,000
64
76
102
1.5
19.8
47.2
42.6
18.2
36.5
15.2
33.5
13.7
30.4
NA
10.6
24.3
9.1
19.8
7.6
13.7
4.5
9.1
3.0
4.5
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)
NA
0
(0.0)
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