Installation & Servicing Instructions Rinnai E-Series
40
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.
6.7.7 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
Add 5 ft.*
Total
Multiply with
factor
Equivalent
length
Combustion air
ft
ft
ft
ft
ft
0.5
ft
Vent
ft
ft
ft
ft
ft
0.5
ft
ft
Total equivalent length
Concentric system
Length concentric
tube, boiler to roof
horizontal
Number of
elbows 90°
x 6*
Number of
elbows 45°
x 3*
Concentric
terminal
Add 2 ft.*
Total
Multiply with
factor
Total equivalent
length
ft
ft
ft
ft
ft
1.0
ft
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Equivalent friction loss of PVC/CPVC
table 9a
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Equivalent friction loss of Centrotherm PPS
table 9b
