2.5 Boilers in a Compartment
Where the installation of the boiler will be in an unusual position,
special requirements are needed, the current issue of BS6798
gives detailed guidance on these requirements.
A compartment used to enclose the boiler must be designed
and constructed specifically for this purpose.
cupboard or compartment modified for the purpose may be
used.
Details of essential requirements for cupboard or
compartment design are given in the current issue of BS6798.
The doorway opening should 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 Table 3.
2.6 Timber Frame Building
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.
221788B
2 Flue and Ventilation
COMPARTMENT
VENTILATION
REQUIREMENTS
An existing
VENTILATION
FROM ROOM
OR SPACE
FROM
OUTSIDE
Under Car Port etc.
MINIMUM SITING DIMENSIONS FORBALANCED FLUE
TERMINALS
A
B
C
D
E
F
G
H
I
J
K
L
8
COMPARTMENT AIR VENT TABLE
HIGH LEVEL
VENT AREA
99cm
2
50cm
A
B,C
G
A
F
A
G
E
G
H,I
POSITION
DIRECTLY BELOW AN OPENABLE
WINDOW, AIR VENT, OR ANY OTHER
VENTILATION OPENING
BELOW GUTTER, DRIAN/SOIL PIPE
BELOW EAVES
BELOW A BALCONY OR CAR PORT
FROM VERTICAL DRAIN PIPES AND
SOIL PIPES
FROM INTERNAL OR EXTERNAL
CORNERS
ABOVE ADJACENT GROUND OR
BALCONY LEVEL
FROM A SURFACE FACING THE
TERMINAL
FACING TERMINALS
FROM OPENING (DOOR/WINDOW) IN
CAR PORT INTO DWELLING
VERTICAL FROM A TERMINAL
HORIZONTALLY FROM A TERMINAL
LOW LEVEL
VENT AREA
15in
2
99cm
2
15in
2
2
2
2
2
7.5in
50cm
7.5in
C
B,C
K
L
L
K
K
F
F
G
G
D
J
F
K
MINIMUM
SPACING (mm)
300
300
300
600
75
250
300
600
600
1200
1500
300
Diagram 2.1
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