Bryant 987MA Installation, Start-Up, Operating And Service And Maintenance Instructions page 45
Modulating 4-way multipoise gas furnace series a
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NOTE: Maximum Equivalent Vent Length (MEVL) does NOT include elbows or terminations. Use Table 14 - Deductions from
Maximum Equivalent Vent Length to determine allowable vent length for each application.
Altitude
Unit Size
FT (M)
60,000
4501 to 5000
80,000
(1370 to
100,000
1524)
120,000
60,000
5001 to 6000
80,000
(1524 to
100,000
1829)
120,000
60,000
6001 to 7000
80,000
(1829 to
100,000
2134)
120,000
60,000
7001 to 8000
80,000
(2134 to
100,000
2438)
120,000
60,000
8001 to 9000
80,000
(2438 to
100,000
2743)
120,000
60,000
9001 to
80,000
10,000
(2743 to
100,000
3048)
120,000
Notes:
1. 3 --- and 4 ---in. Vent pipe systems require long radius elbows.
2. Vent sizing for Canadian installations over 4500 ft. (1370 M) above sea level are subject to acceptance by the local authorities having jurisdiction.
3. NA --- Not allowed; pressure switch will not close, or flame disturbance may result.
4. Do not use pipe size greater than those specified in table or incomplete combustion, flame disturbance, or flame sense lockout may occur.
5. Size both the combustion ---air and vent pipe independently, then use the larger diameter for both pipes.
6. Assume the two 45_ elbows equal one 90_ elbow. Wide radius elbows are desirable and may be required in some cases.
7. Elbows and pipe sections within the furnace casing and at the vent termination should not be included in vent length or elbow count.
8. The minimum pipe length is 5 ft. (1.5 M) for all applications.
9. Use 3 ---in. (76 mm) diameter vent termination kit for installations requiring 4 ---in. (102 mm) diameter pipe.
Table 15 – 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
3
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
45
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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