Doc No. 700015 Page 13 of 36
Option 3 - Figure 6.c. Forced Burner with Heat Exchanger (with Concentric Flue)
E Forced
Burner
F Heat
Exchanger
G 100mm (4ins) Clips x2
H 100mm (4ins) Flexible Flue
J 100mm (4ins) Flexible Flue to Fan
N Flue Extension optional
(0.25m/0.5m/1.0m)
P Concentric Flue Terminal
Fresh
Air
Inlet
E
G
J
F
H
G
P
Fresh
Air
G
Ducted air must be used in locations
where there is airborne dust or where
there is a polluted atmosphere e.g. Chlorinated
Vapours.
Maximum length = 9m
Minimum diameter = 100mm
Maximum no of bends = 2
Maximum flue length = 9.0m @ Ø125mm
Maximum no of bends = 2
All flues must
terminate
vertically.
For further information on flue runs, please refer
to section 1.9.1 BS 5440 pt.1
For flued products of combustion and
ducted air via concentric pipe.
Products of
combustion
IMPORTANT NOTE
This option is a type B
23
flue system
with ducted air and is not a room sealed
balanced flue product.
Products of
combustion
N
Ventilation requirements are as detailed in
section 1.7
Products of
combustion
Firing
Tube
