201
9
Cupboard or compartment air supply:
If the appliance is to be installed in a compartment or cupboard if existing, it should be of sufficient size. This
compart-ment or cupboard must have permanent air vents for combustion air, flue dilution and cooling
purpose!s, the vents being positioned at high and low level. The following minimum size of air vents (free area)
are required:
Position of Air vent Air from room or internal space Air direct from outside
High 252 cm
2
(38 in
2
) 126 cm
2
(19 in
2
)
Low 504 cm
2
(76 in
2
) 252 cm
2
(38 in
2
)
NOTE
Both air vents must communicate with the same room or must be on the same outside wall to outside air.
Where cupboard compartment air vents are open to a room, the room itself must have a permanent air vent(s)
as previously specified.
IMPORTANT
If the boiler is installed in hair dressers premises, ventilation must not be from areas in which aerosol hair
spray is being used. Any spray or materials emitting volatile vapours can be a source of ignition from the
perrnanent pilot of the boiler. Propellants of aerosol srays and fumes of volatile compounds in addition to
being highly flammable in many cases, will also change to corrosive hydrochloric acid when exposed to the
products of combustion of the boiler. The results may be hazardous, causing service problems and produce
failure.
Minimum clearances
Fig. 3
200
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