User Guide

Installation & Servicing Instructions Rinnai E-Series
36
Calculation of equivalent length vent system
Choose the vent type and fi ll out the corresponding table.
* See equivalent length tables and equivalent friction loss tables for 2" and 3" above.
Example of calculation:
2" Twin tube (parallel) with terminal
Combustion air length : 40 ft with elbow 3 x 87°
Vent length : 40 ft with elbow 2 x 87°, elbow 2 x 45°
Calculation:
Equivalent Air Length : (40+3x12+2) x 0.5 = 39 ft
Equivalent Vent Length : (40+2x12+2x6+2) x 0.5 = 39 ft +
Total = 78 ft.
6.6.7 Combustion air and vent piping lengths.
In the table below you will fi nd the maximum equivalent pipe length of the vent/air
system based on 2" and 3" diameter. These lengths are for single pipe (room air)
and twin pipe and concentric venting systems.
Equivalent vent length table 9
Parallel system
Length tube Number of
elbows 90°
x 6*
Number of
elbows 45°
x 3*
Concentric
terminal
A
dd 5 ft.
*
Total Multiply with
factor
Equivalent
length
Combustion air
ft ft ft ft ft 0.5 ft
V
ent
ft ft ft ft ft 0.5 ft
ft
Total equivalent len
g
th
Concentric s
y
stem
Length concentric
tube, boiler to roof
horizontal
Number of
elbows 90°
x 6*
Number of
elbows 45°
x 3*
Concentric
terminal
A
dd 2 ft.
*
Total Multiply with
factor
Total equivalent
length
ft ft ft ft ft 1.0 ft
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