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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.
Altitude
FT (M)
Unit Size
BTU/Hr
DIRECT VENT (2-PIPE) AND NON-DIRECT VENT (1-PIPE)
Vent Pipe Diameter (in.)
1
1-1/2 2 2-1/2 3 4
0 to 2000
(0 to 610)
40,000
3
50 (15.2) 210 (64.0) 250 (76.2) NA
2
NA
60,000 30 (9.1) 135 (41.1) 235 (71.6) 265 (80.8) NA
80,000 20 (6.1) 70 (21.3) 175 (53.3) 235 (71.6) 265 (80.8)
100,000 NA 25 (7.6) 110 (33.5) 235 (71.6) 265 (80.8)
120,000 NA NA 15 (4.6) 100 (30.5) 250 (76.2)
140,000
4
NA NA 10 (3.0) 90 (27.4) 210 (64.0)
2001 to 3000
(610 to 914)
40,000 45 (13.7) 198 (60.4) 232 (70.7) NA NA
60,000 27 (8.2) 127 (38.7) 222 (67.7) 250 (76.2) NA
80,000 17 (5.2) 64 (19.5) 165 (50.3) 222 (67.7) 249 (75.9)
100,000 NA 22 (6.7) 104 (31.7) 223 (68.0) 250 (76.2)
120,000 NA NA 11 (3.4) 93 (28.3) 237 (72.2)
140,000
4
NA NA NA 80 (24.4) 185 (56.4)
3001 to 4000
(914 to 1219)
40,000 39 (11.9) 184 (56.1) 214 (65.2) NA NA
60,000 23 (7.0) 119 (36.3) 210 (64.0) 235 (71.6) NA
80,000 15 (4.6) 59 (18.0) 155 (47.2) 210 (64.0) 232 (70.7)
100,000 NA 19 (5.8) 98 (29.9) 211 (64.3) 236 (71.9)
120,000 NA NA 8 (2.4) 86 (26.2) 224 (68.3)
140,000
4
NA NA NA 79 (24.1) 158 (48.2)
4001 to 4500
(1219 to
1370)
40,000 36 (11.0) 177 (53.9) 205 (62.5) NA NA
60,000 21 (6.4) 115 (35.1) 204 (62.2) 228 (69.5) NA
80,000 14 (4.3) 56 (17.1) 150 (45.7) 202 (61.6) 224 (68.3)
100,000 NA 17 (5.2) 94 (28.7) 205 (62.5) 229 (69.8)
120,000 NA NA NA 83 (25.3) 217 (66.1)
140,000
4
NA NA NA 69 (21.0) 146 (44.5)
NOTES: See notes at end of venting tables.
See Ta ble 3 for altitudes over 4500ft. (1370 M)
Long
Medium
Mitered
Concentric
Standard
ELBOW CONFIGURATIONS VENT TERMINAL CONFIGURATIONS
A11580
915SA