MAXIMUM EQUIVALENT VENT LENGTH - FT. (M)
Table 1 – Maximum Equivalent Vent Length - Ft. (M)
0 to 4500 Ft. (0 to 1370 M) Altitude
NOTE: Maximum Equivalent Vent Length (MEVL) includes standard and concentric vent termination and does NOT include elbows.
Use Table 2 - Deductions from Maximum Equivalent Vent Length to determine allowable vent length for each application.
| Unit Size |
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| DIRECT VENT |
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Altitude | BTU/Hr |
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| Vent Pipe Diameter (in.) 1 |
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FT (M) |
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| 2 |
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| 3 |
| 4 | ||||||
| 40,000 3 | 50 |
| (15.2) | 210 | (64.0) | 250 |
| (76.2) | NA 2 |
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| NA |
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| 60,000 | 30 |
| (9.1) | 135 | (41.1) | 235 |
| (71.6) | 265 |
| (80.8) | NA |
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0 to 2000 | 80,000 | 20 |
| (6.1) | 70 | (21.3) | 175 |
| (53.3) | 235 |
| (71.6) | 265 |
| (80.8) |
(0 to 610) |
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| (33.5) |
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100,000 | NA |
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| 25 | (7.6) | 110 |
| 235 |
| (71.6) | 265 |
| (80.8) | ||
| 120,000 | NA |
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| NA |
| 15 |
| (4.6) | 100 |
| (30.5) | 250 |
| (76.2) |
| 140,000 4 | NA |
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| NA |
| 10 |
| (3.0) |
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| 90 |
| (27.4) | 210 |
| (64.0) | |||||
| 40,000 | 45 |
| (13.7) | 198 | (60.4) | 232 |
| (70.7) | NA |
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| NA |
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| 60,000 | 27 |
| (8.2) | 127 | (38.7) | 222 |
| (67.7) | 250 |
| (76.2) | NA |
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2001 to 3000 | 80,000 | 17 |
| (5.2) | 64 | (19.5) | 165 |
| (50.3) | 222 |
| (67.7) | 249 |
| (75.9) |
(610 to 914) |
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| (31.7) |
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100,000 | NA |
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| 22 | (6.7) | 104 |
| 223 |
| (68.0) | 250 |
| (76.2) | ||
| 120,000 | NA |
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| NA |
| 11 |
| (3.4) | 93 |
| (28.3) | 237 |
| (72.2) |
| 140,000 4 | NA |
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| NA |
| NA |
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| 80 |
| (24.4) | 185 |
| (56.4) |
| 40,000 | 39 |
| (11.9) | 184 | (56.1) | 214 |
| (65.2) | NA |
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| NA |
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| 60,000 | 23 |
| (7.0) | 119 | (36.3) | 210 |
| (64.0) | 235 |
| (71.6) | NA |
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3001 to 4000 | 80,000 | 15 |
| (4.6) | 59 | (18.0) | 155 |
| (47.2) | 210 |
| (64.0) | 232 |
| (70.7) |
(914 to 1219) | 100,000 | NA |
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| 19 | (5.8) | 98 |
| (29.9) | 211 |
| (64.3) | 236 |
| (71.9) |
| 120,000 | NA |
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| NA |
| 8 |
| (2.4) | 86 |
| (26.2) | 224 |
| (68.3) |
| 140,000 4 |
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| NA |
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| NA |
| NA |
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| 79 |
| (24.1) | 158 |
| (48.2) | |
| 40,000 | 36 |
| (11.0) | 177 | (53.9) | 205 |
| (62.5) | NA |
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| NA |
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4001 to 4500 | 60,000 | 21 |
| (6.4) | 115 | (35.1) | 204 |
| (62.2) | 228 |
| (69.5) | NA |
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80,000 | 14 |
| (4.3) | 56 | (17.1) | 150 |
| (45.7) | 202 | (61.6) | 224 | (68.3) | |||
(1219 to |
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1370) | 100,000 | NA |
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| 17 | (5.2) | 94 |
| (28.7) | 205 | (62.5) | 229 | (69.8) | ||
| 120,000 | NA |
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| NA |
| NA |
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| 83 | (25.3) | 217 | (66.1) | ||
| 140,000 4 |
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| NA |
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| NA |
| NA |
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| 69 | (21.0) | 146 | (44.5) | |||
NOTES: See notes at end of venting tables.
See Table 3 for altitudes over 4500 ft. (1370 M)
ELBOW CONFIGURATIONS | VENT TERMINAL CONFIGURATIONS | ||||||
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Concentric
Long | Medium | Mitered |
Standard
A11580
915SA
7
