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6.7.7 Combustion air and vent piping lengths.
Maximum Equivalent Length (Dimension in Feet and Meters) - Model & Vent Type Specific
Item #
Vent type
1
2" PPS Single Pipe (Room Air) & Twin Pipe
2
3" PPS Single Pipe (Room Air) & Twin Pipe
3
2" PPS Twin Pipe to 2"/4" PPS Cnctrc. Termination
4
3" PPS Twin Pipe to 3"/5" PPS Cnctrc. Termination
5
3"/5"PP Concentric Pipe
6
2" Flex Vent
7
3" Flex Vent
8
3" PVC/CPVC Single Pipe & Twin Pipe w/or without 3" CVK Termination
9
2" PVC
Equivalent vent length
Fittings or Piping Equivalent PVC
45 degree elbow
90 degree elbow
plastic pipe per foot
concentric vent kit
Equivalent friction loss of PVC/CPVC
Parallel system
Length tube
Combustion air
Vent
Concentric system
Length concentric
tube, boiler to roof
horizontal
40
In the table below you will find the maximum equivalent pipe length of the vent/air
system based on 2" and 3" diameter. These lengths are for single pipe (room air),
twin pipe, and concentric venting systems.
feet
m
3
0.91
6
1.83
1
0.30
3
0.91
table 9a
Calculation of equivalent length vent system
Choose the vent type and fill out the corresponding table.
* See equivalent length tables and equivalent friction loss tables for 2" and 3" above.
Number of
Number of
elbows 90°
elbows 45°
x 6*
x 3*
ft
ft
ft
ft
Number of
Number of
elbows 90°
elbows 45°
x 6*
x 3*
ft
ft
Example of calculation:
2" Twin tube (parallel) with terminal
Combustion air length
Vent length
Calculation:
Equivalent Air Length
Equivalent Vent Length
Q85S/Q130S
feet
40
100
40
100
100
20
50
100
20
Centrotherm PPS Equivalent lengths for piping fittings
45 degree elbow
87 degree long elbow
Termination Tee
Twin Pipe to Concentric Adapter
Low profile wall termination
Velocity Cone
Equivalent friction loss of Centrotherm PPS
Concentric
Total
terminal
Add 5 ft.*
ft
ft
ft
ft
Total equivalent length
Concentric
Total
terminal
Add 2 ft.*
ft
ft
: 40 ft
with elbow 3 x 87°
: 40 ft
with elbow 2 x 87°, elbow 2 x 45°
: (40+3x12+2) x 0.5
: (40+2x12+2x6+2) x 0.5
Total
Q175C/Q175S
m
feet
m
feet
12.2
---
---
---
30.5
80
24.4
40
12.2
---
---
---
30.5
80
24.4
40
30.5
80
24.4
40
6.1
---
---
---
15.2
40
12.2
20
30.5
80
24.4
40
6.1
---
---
---
feet
6
12
12
4
12
12
Multiply with
Equivalent
factor
length
ft
0.5
ft
0.5
Multiply with
Total equivalent
factor
length
ft
1.0
=
39 ft
=
39 ft +
=
78 ft.
Q205S
m
---
12.2
---
12.2
12.2
---
6.1
12.2
---
table 9
meters
1,83
3,66
3,66
1,22
3,66
3,66
table 9b
ft
ft
ft
ft
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