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0020003579A
3 Flue & Ventilation
3.3 Timber Frame Buildings
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 Glow-worm
3.4 Ventilation for Boiler Installed in a Room
or Space
If the boiler is to be installed in a room or space a purpose
designed permanent ventilation opening, to supply air for
combustion, must be provided on an outside wall to external air,
refer to the current issue of BS5440 Part 2 for details.
The opening may be directly into the room or the space
containing the boiler, or an outside wall of an adjacent room or
space which has an internal permanent air vent, of the same
size, into the room or space containing the boiler.
Do not ventilate through a bedroom, bedsitting room, private
garage or a room containing a bath or shower.
When the boiler is installed in a room or internal space already
containing other fuel burning appliances then the air supply of
such appliances must be taken into account.
The ventilation opening areas are given in “Air Vent Table ”. The
figures quoted refer to the minimum acceptable effective area.
3.5 Ventilation for Boilers Installed in a
Compartment
When the boiler is fitted in a compartment, high and low level
purpose designed, permanent openings must be provided to
supply air for combustion and compartment ventilation.
The air vents must have minimum areas, see “Compartment Air
Vent table". The figures quoted refer to the minimum acceptable
effective area.
Both the high and low level openings must communicate with
the same room, or must both be on the same wall to outside air.
If air vent grilles are fitted to a cavity wall, the opening through
the wall must be ducted.
Where ventilation air to a compartment is taken from a room or
space, then the room or space must be fitted with a ventilation
opening as specified in “Air Vent Table”.
For information regarding compartment requirements refer to
the appropriate section of the current issue of BS6798.
3.6 Ventilation for Boilers installed in a
Cupboard
For minimum ventilation and clearances for cupboard installation
refer to section 1.8 and diagram 1.7.
3.7 Extract Fans
If an extract fan is fitted in the premises, there is a possibility that
if adequate inlet openings are not provided, spillage of the
products from the boiler could occur.
When openings are fitted in accordance with the current issue
of BS5440 Part 2 and this section, extract fans should not cause
down draught, but where such fan installations are found, a
spillage test must be carried out in accordance with the current
issue of BS5440 Part 1 and any corrective work done.
FROM
OUTSIDE
COMPARTMENT AIR VENT TABLE
COMPARTMENT
VENTILATION
REQUIREMENTS
VENTILATION
FROM ROOM
OR SPACE
HIGH LEVEL
LOW LEVEL
VENT AREA
VENT AREA
100C FF 162cm
2
25in
2
323cm
2
50in
2
AIR VENT TABLE
FOR ROOM SPACE INSTALLATIONS
126cm
2
EFFECTIVE AREA OF VENT
20in
2
100C FF
152cm
2
24in
2
115C FF
100C FF 323cm
2
50in
2
646cm
2
100in
2
115C FF 374cm
2
58in
2
747cm
2
116in
2
115C FF 187cm
2
29in
2
374cm
2
58in
2