18
installation
Connecting the Flue
Flue System
The provision for satisfactory fl ue termination must be made as
described in BS 5440-1.
The appliance must be installed so that the fl ue terminal is expo-
sed to outdoor air.
The terminal must not discharge into another room or space such
as an outhouse or lean-to.
It is important that the position of the terminal allows a free pas-
sage of air across it at all times.
The terminal should be located with due regard for the damage
or discolouration that might occur on buildings in the vicinity, it
must also be located in a place not likely to cause nuisance.
In cold or humid weather water vapour may condense on leaving
the fl ue terminal.
The eff ect of such “steaming” must be considered.
If the terminal is less than 2 metres above a balcony, above ground
or above a fl at roof to which people have access, then a suitable
stainless steel terminal guard must be fi tted.
The minimum acceptable spacing from the terminal to obstruc-
tions and ventilation openings are specifi ed in Fig. 1.
- A Directly below an opening, window, etc
300 mm
- B Horizontally to an opening, window, etc
300 mm
- C Below gutters, soils pipes or drain pipes
75 mm
- D Below eaves
200 mm
- E From vertical drain pipe or soil pipe
75 mm
- F From internal or external corner
300 mm
- G Above ground, roof or balcony level
300 mm
- H From a surface facing the terminal
600 mm
- I From a terminal facing a terminal
1200 mm
- J Vertically from a terminal on the same wall
1500 mm
- K Horizontally from an terminal on the same wall
300 mm
- L Fixed by vertical fl ue terminal
Fig. 1
11
8
mm
1
50
mm
M
inimum
L
ength
=
500
mm
1
80
mm
Fig. 2
