12
2.9. CONNECTING THE FLUE
IMPORTANT!!
BEFORE CONNECTING THE FLUE, ENSURE THAT 1 LITRE OF
WATER HAS BEEN POURED INTO THE EXHAUST CONNECTION TO
FILL THE CONDENSATE TRAP
(
F
IG.
2.8).
SHOULD THE TRAP BE
E
MPTY THERE IS A TEMPORARY RISK OF FLUE GASSES
ESCAPING INTO THE ROOM.
FIG. 2.8
Ø 60/100 mm
Fig. 2.10
TERMINAL POSITION mm
A - Directly below an open window or other opening 300
B - Below gutters, solid pipes or drain pipes 75
C - Below eaves 200
D - From vertical drain pipes and soil pipes 75
E - From internal or external corners 300
F - Above ground on a public walkway or patio 2100
G - From a surface facing a terminal 2500
H - From a terminal facing a terminal
2500
I - Vertically from a terminal in the same wall 1500
J - Horizontally from a terminal in the same wall 300
K - Horizontally from an opening window 300
L - Fixed by vertical flue terminal
FLUE SYSTEM
The provision for satisfactory flue termination must be made
as described in BS 5440-1.
The appliance must be installed so that the flue terminal is
exposed 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
passage 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 flue terminal.
The effect of such “steaming” must be considered.
If the terminal is 2.1 metres above a balcony, above ground
or above a flat roof to which people have access, then a
suitable stainless steel terminal guard must be fitted.
The minimum acceptable spacing from the terminal to
obstructions and ventilation openings are specified in Fig.
2.9.
FIG. 2.9
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