Supplied By www.heating spares.co Tel. 0161 620 6677
7
221481C
2 Flue and Ventilation
2.1 Terminal Position
The minimum acceptable spacings from the terminal to
obstructions and ventilation openings are as shown in diagram
2.1.
Where the terminal is fitted within 850mm (34in) below plastic
guttering or within 450mm (18in) of painted eaves or painted
gutters an aluminium shield 750mm (2ft6in) long should be
fitted to the underside and immediately beneath the guttering/
eaves.
2.2 Terminal Protection
A terminal guard is required if persons could come into contact
with the terminal or the terminal could be subject to damage.
If a 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.
A suitable guard can be obtained from,
The Tower Flue Components Ltd.,
Morley Road,
Tonbridge,
Kent,
TN9 1RA
reference “A” black,
2.3 Wall thickness
Check the wall thickness.
The standard flue set supplied is suitable for wall thickness
238mm to 330mm.
For other wall thicknesses, kits are available.
76 to 238mm
- Kit 443235
324 to 580mm
- Kit 443236
2.4 Boilers in a Compartment
Where the installation of the boiler will be in an unusual location,
special procedures are necessary, the current issue of BS6798
gives detailed guidance.
A compartment used to enclose the boiler must be designed
and constructed specifically for this purpose. An existing
cupboard or compartment modified for the purpose may be
used. Details of essential features of cupboard or compartment
design are given in the current issue of BS6798.
The doorway opening must be of sufficient size to allow for easy
removal of the boiler.
Where the boiler is fitted in a cupboard or compartment,
permanent high and low level ventilation must be provided. The
minimum ventilation areas required are given in the respective
Table 5.
2.5 Timber Frame Buildings
If the boiler is to be installed in a timber frame building it should
be fitted in accordance with the Institute of Gas Engineers
document IGE/UP/7/1998. If in doubt seek advice from the local
gas undertaking or Hepworth Heating Ltd.
Under Car Port etc.
H,I
J
D
F
K
A
A
F
G
E
A
G
G
B,C
B,C
F
F
K
K
K
C
L
L
G
G
A DIRECTLY BELOW AN OPENABLE
mm
WINDOW, AIR VENT, OR ANY OTHER
VENTILATION OPENING
300
B BELOW GUTTER, DRAIN/SOIL PIPE
300
C BELOW EAVES
300
D BELOW A BALCONY OR CAR PORT
600
E FROM VERTICAL DRAIN PIPES AND
SOIL PIPES
75
F FROM INTERNAL OR EXTERNAL CORNERS
600
G ABOVE ADJACENT GROUND OR
BALCONY LEVEL
300
H FROM A SURFACE FACING THE TERMINAL
600
I
FACING TERMINALS
600
J FROM OPENING (DOOR/WINDOW) IN CAR
PORT INTO DWELLING
1200
K VERTICAL FROM A TERMINAL
1500
L HORIZONTALLY FROM A TERMINAL
300
MINIMUM
SPACING
Diagram 2.1
MINIMUM SITING DIMENSIONS FOR
BALANCED FLUE TERMINALs POSITION
1112
cm
2
TABLE 5. COMPARTMENT AIR VENTS
HIGH LEVEL
VENT AREA
LOW LEVEL
VENT AREA
in
2
cm
2
in
2
100
16
100
16
50
8
50
8
VENTILATION
FROM
OUTSIDE
VENTILATION
FROM ROOF
OR SPACE
VENTILATION
REQUIREMENTS