Altitude
FT(M)
Table 14
(F/G)9MVT, (F/G)9MXT, (F/G)9MXE - MAXIMUM EQUIVALENT VENT LENTH - 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)
Unit Size Vent Pipe Diameter (in.)
BTU/Hr
1-1/2
50 (15.2) 210
30 (9.1) I 135
7O
2-1/2
(76.2)
(71.6)
(53.3)
(33.5)
(4.6)
(3.0)
(70.7)
(67.7)
(50.3)
(31.7)
(3.4)
40,000 3 (64.0) 250
60,000 I (41.1) 235 265 (80.8)
0 to 2000 80,000 (21.3) 175 235 (71.6) 265 (80.8)
(0 to 610) 100,000 25 (7.6) 110 235 (71.6) 265 (80.8)
120,000 15 100 (30.5) 250 (76.2)
140,0004 10 90 (27.4) 210 (64.0)
40,000 I 45 (13.7) I 198 (60.4) 232
60,000 I 27 (8.2) 1127 (38.7) 222 250 (76.2)
2001 to 3000 80,000 64 (19.5) 165 222 (67.7) 249 (75.9)
(610 to 914) 100,000 22 (6.7) 104 223 (68.0) 250 (76.2)
120,000 11 93 (28.3) 237 (72.2)
140,0004 80 (24.4) 185 (56.4)
40,000 I 39 (11.9) 1 184 (56.1) 214 (65.2)
60,000 I 23 (7.0) I 119 (36.3) 210 (64.0) 235 (71.6)
3001 to 4000 80,000 59 (18.0) 155 (47.2) 210 (64.0) 232 (70.7)
(914 to 1219) 100,000 19 (5.8) 98 (29.9) 211 (84.3) 236 (71.9)
120,000 8 (2.4) 86 (26.2) 224 (68.3)
140,0004 79 (24.1) 158 (48.2)
40,000 I 36 (11.0) 1 177 (53.9) 205 (62.5)
60,000 I 21 (6.4) 1 115 (35.1) 204 (62.2) 228 (69.5)
4001 to 4500 80,000 56 (17.1) 150 (45.7) 202 (61.6) 224 (68.3)
(1219 to 1370) 100,000 17 (5.2) 94 (28.7) 205 (62.5) 229 (69.8)
120,000 83 (25.3) 217 (66.1)
140,0004 69 (21.0) 146 (44.5)
See notes at end of Venting Tables
See Table 16 for altitudes over 4500 ft (1370m).
Table 15 DEDUCTIONS FROM MAXIMUM EQUIVALENT VENT LENGTH - Feet (Meters)
Mitered 90 -0Elbow 8 (2.4) 8 (2.4) 8 (2.4) 8 (2.4) 8 (2.4)
Medium Radius 90-0Elbow 5 (1.5) 5 (1.5) 5 (1.5) 5 (1.5) 5 (1.5)
Long Radius 90-0Elbow 3 (0.9) 3 (0.9) 3 (0.9) 3 (0.9) 3 (0.9)
Mitered 45 -0Elbow 4 (1.2) 4 (1.2) 4 (1.2) 4 (1.2) 4 (1.2)
Medium Radius 45 -0Elbow 2.5 (0.8) 2.5 (0.8) 2.5 (0.8) 2.5 (0.8) 2.5 (0.8)
Long Radius 45 -0Elbow 1.5 (0.5) 1.5 (0.5) 1.5 (0.5) 1.5 (0.5) 1.5 (0.5)
Tee 16 (4.9) 16 (4.9) 16 (4.9) 16 (4.9) 16 (4.9)
Concentric Vent Termination 0 (0.0) 0 (0.0)
Standard Vent Termination 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0)
* Note: 3- and 4-in. vent pipe systems require long radius elbows.
Figure 62 _Elbows Configurations Figure 63
LONG
Vent Terminal Configurations
MEDIUM MITERED
L11F082
L11F083
L11F084
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 04 Specifications subject to change without notice. 55
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