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SITE REQUIREMENTS - Page 5
These boilers are not suitable for external installation. The
appliance must not be installed in bathrooms, shower rooms,
bedrooms, bed-sitting rooms, garages or rooms where highly
inflammable materials or vapours are likely to be present.
Fitting in toilets or cloakrooms is not recommended but is
permitted, provided the combustion air is taken direct from
outside. Where installation of the boiler will be in an unusual
location special procedures may be necessary and BS6798
gives detailed guidance in this aspect.
Ensure that the gas supply pipe and meter are large enough
for this appliance and any others that may be run off the
same meter. Reference should be made to BS6891
Boiler Mounting Surface.
The boiler must be mounted on a flat wall, which may be of
combustible material and must be sufficiently robust to take
the weight of the boiler. It is recommended that any wall
covering behind the boiler that may discolour should be
removed before mounting the boiler. The requirements of the
local authorities and the Building Regulations must be
adhered to.
IMPORTANT NOTICE:
TIMBER FRAMED HOUSES
If the appliance is to be fitted in a timber framed building, it
should be fitted in accordance with British Gas Publication
‘Operational Procedures for Customer Service’ Part 19. If in
any doubt, advice should be sought from the local region of
British Gas.
Clearances Around the Boiler
This appliance must at all times be fitted more than 100mm
(4in) above floor level.
The following minimum clearances must be maintained after
installation for correct operation and servicing of the boiler:-
610mm (2ft) at the front of the boiler.
5mm (0.2in) each side of the boiler.
100mm (4in) at the top.
100mm (4in) at the bottom where fitted above a working
surface etc.
Additional clearances to these may be required for
installation and are left to the discretion of the installer.
Combustion Air and Ventilation Requirements
General recommendations are given in BS5440 Part 2, and
the following notes are given as a general guide.
1. Ventilation of Compartments containing Gas Boilers
THE 60C IS NOT SUITABLE FOR INSTALLATION IN A
COMPARTMENT.
For other models there should be two permanent air vents,
one at low level and one at high level. Each opening,
whether left free or furnished with a grille, must have a
minimum effective area in accordance with Table 1.
TABLE 1
Level of Area for air whether taken
Air Vent from a Room or Outside
sq. in. sq. cm.
30C High 38 245
Low 38 245
40C High 52 335
Low 52 335
50C High 66 425
Low 66 425
There must be at least 300mm (l2in) clearance between the
grille on the front of the boiler casing and any internal
surface of the cupboard to allow for adequate air for
operation of the draught diverter.
Further details for installation of a boiler within a
compartment are given in BS6798.
2. Ventilation of rooms containing Gas Boilers.
The ventilation of the room containing the boiler shall include
air for combustion and draught diverter dilution. This applies
also when the boiler is sited in a compartment, unless the air
vents are both direct from outside.
A permanent air vent shall be provided in an outside wall of
the building at either high or low level.
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