Wolf FGB-K Series Installation And Maintenance Instructions For Contractors page 89

Concentric balanced flue, horizontal C13x, C83x and B33
and flue on an external wall C53x (examples) DN80/125
1 Gas condensing boiler
2 Adaptor DN60/100
to DN80/125
3 Balanced flue with
inspection port DN80/125
(250 mm long)
4 Balanced flue
DN80/125
500 mm
1000 mm
2000 mm
5 Spacer bracket
10 Inspection bend 87°
DN 80/125
11 Bend 87°
DN 80/125
15 Balanced flue
horizontal,
with wind protector
16 Pipe collar
17 External wall panel 87°
DN80/125
with smooth air pipe end
18 Balanced flue, external walls
DN80/125
19 Air inlet, external wall
DN80/125
20 Conc. outlet terminal
with clamp fitting
21 Connection to a
flue gas chimney B33
Length 250 mm
with air aperture
22 Support rail
23 Support bend 87° DN80
24 Spacer
25 PP flue pipe DN80
26 Shaft cover with
UV resistant terminal
28 Inspection tee
29 Air pipe Ø 125 mm
30 Air inlet pipe Ø 125 mm
3064458_201811
31. Technical information, balanced flue
Horizontal balanced flue routed
through pitched roof
C13x C53x
Install the horizontal flue pipe with a slope of approx. 3° (6 cm/m) towards the boiler.
Route the horizontal air supply with a 3° slope towards the outside – provide the
air inlet with a wind protector; permissible wind pressure at the air inlet 90 Pa. The
burner will not start if the wind pressure is higher. After the support bend (23), the flue
can be routed in DN80 inside the shaft. A flexible flue pipe DN83 can be connected
downstream of support bend (23).
Dormer
Flue routed along
external wall
(only where required)
Recess Ø 90 mm in
chimney side. Install the
flue pipe airtight into the
chimney side.
B33
C83x
89