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INSTALLATION INSTRUCTIONS
Table 14
(F/G)9MVT, (F/G)9MXT, (F/G)9MXE − 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
3
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).
DEDUCTIONS FROM MAXIMUM EQUIVALENT VENT LENGTH - Feet (Meters)
Table 15
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
Concentric Vent Termination
Standard Vent Termination
Figure 62
Elbows Configurations
LONG
MEDIUM
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 4001 05
DIRECT VENT (2-PIPE) AND NON-DIRECT VENT (1-PIPE)
1-1/2
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
11/2
8
(2.4)
5
(1.5)
3
(0.9)
4
(1.2)
2.5
(0.8)
1.5
(0.5)
Tee
16
(4.9)
NA
0
(0.0)
MITERED
L11F082
Specifications subject to change without notice.
Gas Furnace: (F/G)9MVT, (F/G)9MXT, (F/G)9MXE
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
2
21/2
8
(2.4)
8
(2.4)
5
(1.5)
5
(1.5)
3
(0.9)
3
(0.9)
4
(1.2)
4
(1.2)
2.5
(0.8)
2.5
(0.8)
1.5
(0.5)
1.5
(0.5)
16
(4.9)
16
(4.9)
0
(0.0)
NA
0
(0.0)
0
(0.0)
Figure 63
Vent Terminal Configurations
3
4
2
NA
NA
265
(80.8)
NA
235
(71.6)
265
235
(71.6)
265
100
(30.5)
250
90
(27.4)
210
NA
NA
250
(76.2)
NA
222
(67.7)
249
223
(68.0)
250
93
(28.3)
237
80
(24.4)
185
NA
NA
235
(71.6)
NA
210
(64.0)
232
211
(64.3)
236
86
(26.2)
224
79
(24.1)
158
NA
NA
228
(69.5)
NA
202
(61.6)
224
205
(62.5)
229
83
(25.3)
217
69
(21.0)
146
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
0
(0.0)
NA
0
(0.0)
0
STANDARD 2−IN.,
3−IN. OR OPTIONAL
4−IN. TERMINATION
L11F083
(80.8)
(80.8)
(76.2)
(64.0)
(75.9)
(76.2)
(72.2)
(56.4)
(70.7)
(71.9)
(68.3)
(48.2)
(68.3)
(69.8)
(66.1)
(44.5)
(2.4)
(1.5)
(0.9)
(1.2)
(0.8)
(0.5)
(4.9)
(0.0)
A13110
55
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