12
Products of
combustion
Fresh
Air
Fresh Air
Inlet
Firing
Tube
A
Concentric Flue Terminal
B
4ins Flexible to concentric flue
C
4ins Flexible to Fan
D Heat
Exchanger
E 4ins
Clips
F Forced
Burner
G Flue Extension optional
(10ins/20ins/40ins)
Products of
combustion
if heaters are installed with no flue the
ventilation instructions detailed in section
1.8 must be applied.
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 = 30ft
Minimum diameter = 4ins
Maximum no of bends = 2
Option 3 - Figure 8.c. Forced Burner with Heat Exchanger (with Concentric Flue)
For flued products of combustion and
ducted air via concentric pipe
Products of
combustion
10ins
54ins
23ins
9ins
Refer to section 1.8.3 for Maximum
length of vent.