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Table 15 —- Maximum Equivalent Vent Length
- Ft. (VM)
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 16 - Deductions from Maximum Equivalent Vent Length to determine allowable vent length for each application.
DIRECT VENT (2-PIPE) AND NON-DIRECT VENT (1-PIPE)
Altitude
BTU/Hr
FT (M)
0 to 2000
(0 to 610)
2001 to 3000
(610 to 914)
3001 to 4000
(914 to 1219)
4001 to 4500
(1219 to
1370)
See Table 17 for altitudes over 4500 ft. (1870 M)
ELBOW CONFIGURATIONS
VENT TERMINAL CONFIGURATIONS
&
ey
:
Concentric
Long
Medium
Mitered
(FP
AW
oo (((
{
Jp
7
CO
LY
Standard
A11580
Table 16 — Deductions from Maximum Equivalent Vent Length - Ft. (M)
Pipe Diameter (in):
4-1/2
2
2-1/2
3
4
Mitered 902° Elbow
8
(2.4)
8
(2.4)
8
(2.4)
8
(2.4)
8
(2.4)
Medium
Radius 902 Elbow
5
(1.5)
5
(1.5)
5
(1.5)
5
(1.5)
5
(1.5)
Long Radius 902 Elbow
3
(0.9)
3
(0.9)
3
(0.9)
3
(0.9)
3
(0.9)
Mitered 45° Elbow
4
(1.2)
4
(1.2)
4
(1.2)
4
(1.2)
4
(1.2)
Medium Radius 452 Elbow
25
(0.8)
25
(0.8)
25
(0.8)
25
(0.8)
25
(0.8)
Long Radius 45° Elbow
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)
Standard Vent Termination
(0.0)
(0.0)
47
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