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Maximum Equivalent Vent Lenth - Feet (Meters) - International comfort products N9MSB Installation Instructions Manual

Single−stage, psc blower motor 35” tall, high efficiency condensing gas furnace
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INSTALLATION INSTRUCTIONS
Table 14
N9MSB & N9MSE − MAXIMUM EQUIVALENT VENT LENGTH - Feet (Meters)
Note: Maximum Equivalent Vent Length (MEVL) does NOT include elbows or terminations
Use Table 15 − DEDUCTIONS FROM MEVL to determine allowable vent length for each application.
Altitude
Unit Size
FT (M)
BTU/Hr
40,000
60,000
80,000
0 to 2000
(0 to 610)
100,000
120,000
140,000
40,000
60,000
80,000
2001 to 3000
(610 to 914)
100,000
120,000
140,000
40,000
60,000
80,000
3001 to 4000
(914 to 1219)
100,000
120,000
140,000
40,000
60,000
80,000
4001 to 4500
(1219 to 1370)
100,000
120,000
140,000
See notes at end of Venting Tables
See Table 16 for altitudes over 4500 ft (1370m).
Figure 60
Elbows Configurations
LONG
MEDIUM
Table 15
DEDUCTIONS FROM MAXIMUM EQUIVALENT VENT LENGTH - Feet (Meters)
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
* Note: 3- and 4-in. vent pipe systems require long radius elbows.
Venting System Length Calculations
The Total Equivalent Vent Length for EACH combustion air or vent pipe equals the length of the venting system, plus the equivalent
length of elbows used in the venting system from Table 15.
Standard vent terminations or factory accessory concentric vent terminations count for zero deduction.
See vent system manufacturer's data for equivalent lengths of flexible vent pipe or other termination systems. DO NOT ASSUME
that one foot of flexible vent pipe equals one foot of straight PVC/ABS DWV vent pipe.
Compare the Total Equivalent Vent Length to the Maximum Equivalent Vent Lengths in Table 14 and Table 16.
440 01 4101 03
DIRECT VENT (2-PIPE) AND NON-DIRECT VENT (1-PIPE)
1-1/2
3
50
(15.2)
210
30
(9.1)
135
20
(6.1)
70
NA
25
NA
4
NA
45
(13.7)
198
27
(8.2)
127
17
(5.2)
64
NA
22
NA
4
NA
39
(11.9)
184
23
(7.0)
119
15
(4.6)
59
NA
19
NA
4
NA
36
(11.0)
177
21
(6.4)
115
14
(4.3)
56
NA
17
NA
4
NA
MITERED
L11F082
1­1/2
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
Tee
16
(4.9)
16
Specifications subject to change without notice.
Gas Furnace: N9MSB, N9MSE
Vent Pipe Diameter (in.)
2
2-1/2
(64.0)
250
(76.2)
(41.1)
235
(71.6)
(21.3)
175
(53.3)
(7.6)
110
(33.5)
NA
15
(4.6)
NA
10
(3.0)
(60.4)
232
(70.7)
(38.7)
222
(67.7)
(19.5)
165
(50.3)
(6.7)
104
(31.7)
NA
11
(3.4)
NA
NA
(56.1)
214
(65.2)
(36.3)
210
(64.0)
(18.0)
155
(47.2)
(5.8)
98
(29.9)
NA
8
(2.4)
NA
NA
(53.9)
205
(62.5)
(35.1)
204
(62.2)
(17.1)
150
(45.7)
(5.2)
94
(28.7)
NA
NA
NA
NA
Figure 61
Vent Terminal Configurations
2
2­1/2
(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)
3
4
2
NA
NA
265
(80.8)
NA
235
(71.6)
265
(80.8)
235
(71.6)
265
(80.8)
100
(30.5)
250
(76.2)
90
(27.4)
210
(64.0)
NA
NA
250
(76.2)
NA
222
(67.7)
249
(75.9)
223
(68.0)
250
(76.2)
93
(28.3)
237
(72.2)
80
(24.4)
185
(56.4)
NA
NA
235
(71.6)
NA
210
(64.0)
232
(70.7)
211
(64.3)
236
(71.9)
86
(26.2)
224
(68.3)
79
(24.1)
158
(48.2)
NA
NA
228
(69.5)
NA
202
(61.6)
224
(68.3)
205
(62.5)
229
(69.8)
83
(25.3)
217
(66.1)
69
(21.0)
146
(44.5)
L11F083
L11F084
3
4
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
(2.4)
(1.5)
(0.9)
(1.2)
(0.8)
(0.5)
(4.9)
53
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