Bryant 987MA Installation, Start-Up, Operating And Service And Maintenance Instructions page 52
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NOTE: Maximum Equivalent Vent Length (MEVL) includes standard and concentric vent termination and does NOT include elbows.
Use Table 16 - Deductions from Maximum Equivalent Vent Length to determine allowable vent length for each application.
Altitude
Unit Size
FT (M)
60,000
80,000
4501 to 5000
(1370 to 1524)
100,000
120,000
60,000
80,000
5001 to 6000
(1524 to 1829)
100,000
120,000
60,000
80,000
6001 to 7000
(1829 to 2134)
100,000
120,000
60,000
80,000
7001 to 8000
(2134 to 2438)
100,000
120,000
60,000
80,000
8001 to 9000
(2438 to 2743)
100,000
120,000
60,000
80,000
9001 to 10,000
(2743 to 3048)
100,000
120,000
Notes:
1. Use only the vent pipe sizes shown for each furnace. It is NOT necessary to choose the smallest diameter pipe possible for venting.
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 - - Ft. (M)
4501 to 10,000 Ft. (0 to 1370 M) Altitude
DIRECT VENT (2-PIPE) AND VENTILATED COMBUSTION AIR ONLY
1-1/2
2
35
(10.7)
111
(33.8)
23
(7.0)
85
(25.9)
NA
40
(12.2)
NA
NA
37
(11.3)
103
(31.4)
22
(6.7)
76
(23.2)
NA
33
(10.1)
NA
NA
35
(10.7)
96
(29.3)
20
(6.1)
71
(21.6)
NA
31
(9.4)
NA
NA
32
(9.8)
89
(27.1)
18
(5.5)
66
(20.1)
NA
29
(8.8)
NA
NA
30
(9.1)
82
(25.0)
17
(5.2)
62
(18.9)
NA
27
(8.2)
NA
NA
27
(8.2)
76
(23.2)
15
(4.6)
57
(17.4)
NA
24
(7.3)
NA
NA
Vent Pipe Diameter
2-1/2
198
(60.4)
221
146
(44.5)
195
91
(27.7)
200
NA
80
186
(56.7)
207
137
(41.8)
183
85
(25.9)
188
NA
74
174
(53.0)
194
120
(36.6)
171
79
(24.1)
178
NA
68
163
(49.7)
181
120
(36.6)
159
73
(22.3)
167
NA
62
152
(46.3)
168
111
(33.8)
148
67
(20.4)
157
NA
56
142
(43.3)
156
103
(31.4)
137
62
(18.9)
147
NA
51
52
3
4
(67.4)
NA
(59.4)
216
(65.8)
(61.0)
222
(67.7)
(24.4)
211
(64.3)
(63.1)
NA
(55.8)
200
(61.0)
(57.3)
208
(63.4)
(22.6)
199
(60.7)
(59.1)
NA
(52.1)
185
(56.4)
(54.3)
195
(59.4)
(20.7)
187
(57.0)
(55.2)
NA
(48.5)
170
(51.8)
(50.9)
182
(55.5)
(18.9)
175
(53.3)
(51.2)
NA
(45.1)
156
(47.5)
(47.9)
170
(51.8)
(17.1)
164
(50.0)
(47.5)
NA
(41.8)
142
(43.3)
(44.8)
157
(47.9)
(15.5)
153
(46.6)
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