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221834B
Diagram 4.4
0103M
A
A
F
G
E
A
G
G
G
B,C
B,C
F
F
K
K
K
C
G
L
L
A DIRECTLY BELOW AN OPENABLE
WINDOW, AIR VENT, OR ANY OTHER
VENTILATION OPENING 300
B BELOW GUTTER, DRAIN/SOIL PIPE 75
C BELOW EAVES 200
E FROM VERTICAL DRAIN PIPES AND
SOIL PIPES 75
F FROM INTERNAL OR EXTERNAL
CORNERS 300
G ABOVE ADJACENT GROUND OR
BALCONY LEVEL 300
H FROM A SURFACE FACING THE
TERMINAL 600
*
I FACING TERMINALS 1200
K VERTICAL FROM A TERMINAL 1500
L HORIZONTALLY FROM A TERMINAL 300
MINIMUM SITING DIMENSIONS
FOR FANNED FLUE
TERMINALS POSITION
MINIMUM
SPACING
in mm
H,I
4 Flue
4.1 Terminal Position
The minimum acceptable spacings from the terminal to
obstructions and ventilation openings are as shown in diagram
4.4.
The boiler must be installed so that the terminal is exposed to
the external air.
It is important that the position of the terminal allows the free
passage of air across it at all times.
Note. The flue will produce a plume of condensation in cold
weather, so special care must be taken in siting the flue terminal
so as not to cause a nuisance to adjacent property.
Where the terminal is fitted within 600mm (24in) below plastic
guttering an aluminium shield 1500mm (5ft) long should be
fitted to the underside and immediately beneath the guttering or
eaves.
Where the terminal is fitted within 450mm (18in) below eaves or
painted guttering an aluminium shield 750mm (2ft6in) long
should be fitted to the underside and immediately beneath the
guttering or eaves.
4.2 Terminal Guard
A terminal guard is required if persons could come into contact
with the terminal or the terminal could be subject to damage.
If a terminal guard is required, it must be positioned to provide
a minimum of 50mm clearance from any part of the terminal and
be central over the terminal, see diagram 4.4.
A suitable terminal guard can be obtained from:
Tower Flue Components Ltd.,
Morley Road,
Tonbridge,
Kent.
TN9 1RA
their reference, CGD K3 BL
0161M
* It may be necessary to increase this dimension to prevent
staining of adjacent walls depending on weather conditions.