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3062547_201802
Air/flue gas routing
36 Technical information
Condensing boiler versions
Maximum length
1)
COB-15 COB-20 COB-29 COB-40
B23
Flue in a duct and combustion air directly via the appliance
(open flue)
DN 60
20
-
-
-
DN 80
30
30
30
-
DN 110
-
-
-
30
B33
Flue in duct with horizontal, concentric supply line (open flue)
DN 60
18
-
-
-
DN 80
30
30
30
-
DN 110
-
-
30
B 33
Connection to a moisture-resistant chimney with
horizontal concentric connection pipe (open flue)
Calculation to EN 13384
(balanced flue manufacturer)
C33x
Vertical concentric roof outlet through a pitched or flat roof,
vertical concentric balanced flue for installation in a duct,
(balanced flue)
DN60/110
9
-
-
-
DN 80/125
24
22
18
-
DN110/160
-
-
-
14
C43x
Connection to a moisture-resistant balanced flue chimney,
maximum pipe length from centre of boiler bend to connection
3 m (room sealed)
Calculation to EN 13384
(balanced flue manufacturer)
C53
Connection to the flue in a shaft and supply air pipe through an
external wall (balanced flue, supply air pipe 4 m, 1x bend 87°)
DN 80/125
30
30
30
-
DN110/160
-
-
-
30
C53x
Connection to a flue on an external wall
(room sealed/balanced flue)
DN 80/125
30
30
30
-
DN110/160
-
-
-
30
C53x
Connection to the flue in a shaft and supply air through an
external wall (balanced flue, supply air pipe 4 m, 1x bend 87°)
DN 80/125
30
30
30
-
DN110/160
-
-
-
30
C83x
Concentric connection to moisture-resistant flue gas chimney and
combustion air through external wall (room sealed)
Calculation to EN 13384
(balanced flue manufacturer)
C93x
Vertical flue for installation in a shaft, with minimum dimensions
rigid or flexible with horizontal concentric connection pipe
DN 60/110, vertical DN 60
Rigid DN 60
13
-
-
-
Flexible DN 60
9
-
-
-
C93x
Vertical flue for installation in a shaft, with minimum dimensions
rigid or flexible with horizontal concentric connection pipe
DN 80/125, vertical DN 80 or DN 83
Rigid DN 80
29
24
21
-
Flexible DN 83
27
21
17
-
C93x
Vertical flue for installation in a shaft, with minimum dimensions
rigid or flexible with horizontal concentric connection pipe
DN 110/160, vertical DN 110
Rigid DN 110
-
-
-
22
Flexible
DN 110
-
-
-
22
1)
Available fan draught: COB-15: 32-65 Pa / COB-20: 45-65 Pa / COB-29: 55-105 Pa / COB-40: 70-150 Pa
(The maximum length corresponds to the total length from the appliance to the flue terminal)
The calculation was made taking the pressure conditions into account (geodetic height: 325 m). The specified lengths refer
to concentric balanced flues and standard flues, and apply to original WOLF components only.
Where necessary, adapt the installation examples to the relevant building regulations and requirements in your country/region. Discuss any
questions relating to the installation, particularly regarding the inspection components and ventilation apertures, prior to installation with your
local flue gas inspector.
Note
Calculating the balanced flue length
The calculated length of the balanced flue or standard
flue is derived from the straight pipe length and the length
equivalent of any pipe bends.
Example:
Length of straight balanced flue 5.5 m
87° support bend = 2.0 m
2 x 45° bends = 2 x 1.2 m
L = 5.5 m + 1 x 2.0 m + 2 x 1.2 m
L = 9.9 m
Bend
Type
Calculated length [m]
30°
Single wall
0,4
45°
Single wall
0,6
87°
Single wall
1,0
30°
Concentric
0,7
45°
Concentric
1,2
87°
Concentric
2,0
Summary of Contents for COB
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