10
A 5ins Twin Wall Flue Pipe
B 5ins to 4ins Reducer
C 4ins
Clip
D 4ins Flexible Flue
E 4ins Flexible Flue to Fan
F Heat
Exchanger
G Forced
Burner
Products of combustion
Products of combustion
Firing tube
Air
Inlet
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 = 4in
Maximum no of bends = 2
Option 1 - Figure 8.a. Forced Burner with Heat Exchanger (Standard Flue)
For flued products of combustion and no ducted air
Refer to section 1.8.3 for Maximum
length of vent.