Venting System Length Calculations - Bryant EVOLUTION 987MA Product Data
Modulating 4-way multipose, variable speed condensing gas furnace, series a
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NOTE: Maximum Equivalent Vent Length (MEVL) does NOT include elbows or terminations. Use Table 2 - Deductions from
Maximum Equivalent Vent Length to determine allowable vent length for each application.
Altitude
Unit Size
FT (M)
BTU/Hr
60,000
80,000
0 to 2000
(0 to 610)
100,000
120,000
60,000
80,000
2001 to 3000
(610 to 914)
100,000
120,000
60,000
80,000
3001 to 4000
(914 to 1219)
100,000
120,000
60,000
4001 to 4500
80,000
(1219 to
100,000
1370)
120,000
* See notes at end of venting tables.
*See Table 3 for altitudes over 4500 ft. (1370 M)
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
* Note: 3 --- and 4 ---in. Vent pipe systems require long radius elbows.
Venting System Length Calculations
The maximum length for each vent pipe (inlet or exhaust) equals the Maximum Equivalent Vent Length (MEVL) from Table 1 or Table 3
minus the number of elbows multiplied by the deduction for each elbow in Table 2.
Standard vent terminations and concentric vent terminations count for zero deductions.
Example
A direct- -vent 60,000 Btuh furnace installed at 2100 ft. (640 m) with 2- -in.(51 mm) Vent piping. Venting system includes, FOR EACH
PIPE, (3) 90_ long radius elbows, (2) 45_ long radius elbows and a concentric vent kit.
Maximum Equivalent Vent Length
Deduct (3) 90 long radius
Deduct (2) 45 long radius
Maximum Vent Length
MAXIMUM EQUIVALENT VENT LENGTH - - FT. (M)
Table 1 – Maximum Equivalent Vent Length - - Ft. (M)
0 to 4500 Ft. (0 to 1370 M) Altitude
DIRECT VENT (2-PIPE) AND VENTILATED COMBUSTION AIR ONLY
1-1/2
55
(16.8)
135
35
(10.7)
130
NA
50
NA
45
(13.7)
127
30
(9.1)
90
NA
40
NA
40
(12.2)
119
25
(7.6)
85
NA
40
NA
35
(10.7)
115
23
(7.0)
85
NA
40
NA
Table 2 – Deductions from Maximum Equivalent Vent Length - - Ft. (M)
1-1/2
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
x
2
x
Vent Pipe Diameter (in.)
2
2-1/2
(41.1)
235
(71.6)
(39.6)
175
(53.3)
(15.2)
110
(33.5)
NA
15
(4.6)
(38.7)
222
(67.7)
(27.4)
165
(50.3)
(12.2)
104
(31.7)
NA
11
(3.4)
(36.3)
210
(64.0)
(25.9)
155
(47.2)
(12.2)
98
(29.9)
NA
8
(2.4)
(35.1)
204
(62.2)
(25.9)
150
(45.7)
(12.2)
94
(28.7)
NA
NA
2
2-1/2
(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)
=
127 ft.
3 ft.
=
- 9 ft.
1.5 ft.
=
- 3 ft.
=
115 ft.
7
3
4
265
(80.8)
NA
235
(71.6)
265
(80.8)
235
(71.6)
265
(80.8)
100
(30.5)
250
(76.2)
250
(76.2)
NA
222
(67.7)
249
(75.9)
223
(68.0)
250
(76.2)
93
(28.3)
237
(72.2)
235
(71.6)
NA
210
(64.0)
232
(70.7)
211
(64.3)
236
(71.9)
86
(26.2)
224
(68.3)
228
(69.5)
NA
202
(61.6)
224
(68.3)
205
(62.5)
229
(69.8)
83
(25.3)
217
(66.1)
3*
4*
NA
NA
NA
NA
NA
NA
NA
NA
3
(0.9)
3
(0.9)
NA
NA
NA
NA
NA
NA
NA
NA
1.5
(0.5)
1.5
(0.5)
16
(4.9)
16
(4.9)
(From Table 1)
(From Table 2)
(From Table 2)
For EACH vent or inlet pipe
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