Table 14 (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 len,qth for each application.
DIRECT VENT (2-PIPE) AND NON-DIRECT VENT (1-PIPE)
Altitude
FT (M)
40,000 3
60,000
0 to 2000 80,000
(0 to 610) 100,000
120,000
"140,0004
40,000
60,000
2001 to 3000 80,000
(610 to 914) 100,000
120,000
"140,0004
40,000
60,000
3001 to 4000 80,000
(914 to 1219) 100,000
120,000
"140,0004
40,000
60,000
4001 to 4500 80,000
(1219 to 1370) 100,000
120,000
"140,0004
See notes at end of Ventinc Tables
See Table 16 for altitudes over 4500 ft (1370rn).
Unit Size Vent Pipe Diameter (in.)
BTU/Hr
1-1/2 2 2-1/2 3 4
50 I (15.2) 210 (64.0) 250 (76.2)
I 30 (9.1) I 135 (41.1) 235 (71.6) 265 (80.8)
70 (21.3) 175 (53.3) 235 (71.6) 265 (80.8)
25 (7.6) 110 (33.5) 235 (71.6) 265 (80.8)
15 (4.6) 100 (30.5) 250 (76.2)
10 (3.0) 90 (27.4) 210 (64.0)
I 45 I (13.7) I 198 (60.4) 232 (70.7)
I 27 (8.2) I 127 (38.7) 222 (67.7) 250 (76.2)
64 (19.5) 165 (50.3) 222 (67.7) 249 (75.9)
22 (6.7) 104 (31.7) 223 (68.0) 250 (76.2)
11 (3.4) 93 (28.3) 237 (72.2)
80 (24.4) 185 (56.4)
I 39 (11.9) I 184 (56.1) 214 (65.2)
I 23 (7.0) 1 119 (36.3) 210 (64.0) 235 (71.6)
59 (18.0) 155 (47.2) 210 (64.0)
19 (5.8) 98 (29.9) 211 (64.3)
8 (2.4) 86 (26.2)
79 (24.1)
232 (70.7)
236 (71.9)
224 (68.3)
158 (48.2)
Table 15
I 36 (11.0) I 177 (53.9) 205 (62.5)
I 21 (6.4) 1 115 (35.1) 204 (62.2) 228 (69.5)
56 (17.1) 150 (45.7) 202 (61.6) 224
17 (5.2) 94 (28.7) 205 (62.5) 229
83 (25.3) 217
69 (21.0) 146
DEDUCTIONS FROM MAXIMUM EQUIVALENT VENT LENGTH - Feet (Meters)
Pipe Diameter (in): 1-1/2
Mitered 90-0Elbow 8 (2.4)
Medium Radius 90-0Elbow 5 (1.5)
Long Radius 90-0Elbow 3 (0.9)
Mitered 45-0Elbow 4 (1.2)
Medium Radius 45-0Elbow 2.5 (0.8)
Long Radius 45-0Elbow 1.5 (0.5)
Tee 16 (4.9)
Concentric Vent Termination
Standard Vent Termination 0 (0.0)
Figure 62 Elbows Configurations
m m
LONG MEDIUM MITERED
L11F082
2 2-1/2 3
8 (2.4) 8 (2.4) 8 (2.4)
5 (1.5) 5 (1.5) 5 (1.5)
3 (0.9) 3 (0.9) 3 (0.9)
4 (1.2) 4 (1.2) 4 (1.2)
2.5 (0.8) 2.5 (0.8) 2.5 (0.8)
1.5 (0.5) 1.5 (0.5) 1.5 (0.5)
16 (4.9) 16 (4.9) 16 (4.9)
o (o.o) o (o.o)
o (o.o) o (o.o) o (o.o) o
Figure 63 Vent Terminal Configurations
L
(68.3)
(69.8)
(66.1)
(44.5)
4
8 (2.4)
5 (1.5)
3 (0.9)
4 (1.2)
2.5 (0.8)
1.5 (0.5)
16 (4.9)
(0.0)
S_,TAN A%%NNAL
4-IN. TERMINATION
L11F083
A13110
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,
54 Specifications subject to change without notice. 440 01 4001 08
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