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Detailed recommendations for air supply are given
in BS.5440.2. The following notes are intended for
general guidance.
Where the boiler is to be installed in a room or inter-
nal space, the boiler does not require the room or in-
temal space containing it to have a permanent air
vent.
Where the boiler is to be installed in a cupboard or
compartment, permanent high and low level air
vents are required for cooling purposes in the cup-
board or compartment. Both vents must communi-
cate with the same wall to outside air.
The minimum effective area of the permanent air
vents required in the cupboard or compartment are
given in next Table "air vent areas".
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Detailed requirements are given in BS 5440.2.
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The expansion vessel is suitable for systems up to
OLWUHVwater content. For systems in excess of
this capacity an additional pressurized expansion
vessel will be required. BS7074 and "British Gas
Specifications for Domestic Wet Central Heating
Systems" Part 3 gives guidance in this subject.
The central heating system should be in accordance
with the relevant recommendations given in
BS.6798 and, in addition, for small bore and mi-
crobore systems - BS.5449.1. The domestic hot wa-
ter system, if applicable, should be in accordance
with the relevant recommendations of BS.5546.
Copper tubing, to BS. 287 1. 1, is recommended for
water carrying pipework.
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Wiring extemal to the boiler must be in accordance
with the I.E.E. Wiring Regulations and any local reg-
ulations.
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High level
186 cm
2
93 cm
2
29 in
2
15 in
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Low level
186 cm
2
93 cm
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29 in
2
15 in
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