Worcester GREENSTAR HEATSLAVE12/18 User Instructions page 15

8 716 106 253f 30/3/10
Conventional flue boilers require an adequate supply of fresh air which must be delivered to the boiler
for combustion purposes through a permanent inlet, such as an air brick, into the area where the
boiler is situated.
If a cupboard or compartment which is to be used for storage or airing is built around the boiler after
installation there must be a non-combustible partition around the boiler. Further information can be
found in BS 5410 which also describes venting requirements.
Conventional flued boilers:
Minimum area of of air inlet for combustion:
MINIMUM AIR VENT AREA (cm
1 Internal air to and from a space/room inside the building. 2 External air to and from directly outside the building.
Conventional flue
1
Internal ventilation External
High
kW
Level
12/18 198
18/25 275
25/32 352
Venting compartments:
Ventilation must be provided for boilers fitted into compartments as described in BS 5410
A minimum of two air vents must be fitted, one at low level and another at high level onto the
same wall using the same air for circulation.
Combustion air must not be taken from a room or internal space containing a bath or shower and
must not communicate with a protected area such as a hall, stairway, landing, corridor, lobby,
shaft etc.
Air vents must allow access for clean free air and must be sited to comply with the flue
terminal position requirements.
Air ducting runs must not exceed 3m.
Low level air vents must be less than 450mm from the floor.
A warning label must be attached to the vents with a statement to the effect:
''Do not block this vent.
Do not use for storage''.
12:59 Page 15
) FOR BOILERS INSTALLED IN A COMPARTMENT:
2
2
ventilation
Low High Low
Level Level Level
279 99 198
413 138 275
528 176 352
GREENSTAR HEATSLAVE 12/18 - 18/25 - 25/32
8 716 106 253f (03.2010)
VENTILATION INFORMATION
2
kW Area (cm )
12/18 99
18/25 138
25/32 176
Room Sealed flue:
1
Internal ventilation External
High Low
kW
Level Level
12/18 198 198
18/25 275 275
25/32 352 352
VENTILATION INFORMATION
2
ventilation
High Low
Level Level
99 99
138 138
176 176
13