Detailed recommendations of the flue are shown in BS6644, BS5440 and IM/11. The following notes
are intended for guidance only.
The area of the flue serving the boiler, must not be less than the area of the boiler flue outlet. Nominal
flue pipe diameters between the boiler and chimney should be in accordance with the following table:-
9
REGENCY2
L O W
P R O F I L E
3.2 flue
system
Flue pipes and fittings should be constructed from aluminium, stainless steel or suitable flue material.
Any double walled flue pipe must be acceptable to current regulations. Chimneys should be lined with non-
porous acid resistant material in accordance with BS5854, such as stainless steel flexible flue liner or a
similar approved material. The internal diameter of the liner must not be less than the recommended flue
pipe and the number of joints should be kept to a minimum. Any joints between the flexible liner and the
flue pipe from the boiler, should be effected by means of a purpose built adaptor plate.
Existing flues should be thoroughly swept before use and any register plates or dampers should be
removed. The flue should be fitted with a approved terminal on boiler sizes G100, G100/30IE and
G100/40IE. On boiler sizes G100/50IE, G100/70IE, G100/90IE and G100/110IE, the flue outlet should
be fitted with a wire mesh to protect against blockage. The terminal should not be sited adjacent to any
opening window, air vent or other ventilation opening and should be situated at least 1m above the roof
surface. All should be in accordance with BS6644 or BS5440 as appropriate.
Boiler Model
G100/30IE
G100/40IE
G100/50IE
G100/70IE
G100/90IE
G100/110IE
Diameter (mm)
155
155
202
202
254
254
Diameter (in)
6
6
8
8
10
10
Detailed recommendations for air supply are given in BS6644 or BS5440 as appropriate. The following
notes are given as guidance.
air supply by natural ventilation
The purpose built space housing the boiler(s), must have permanent air vents communicating directly
with the outside air at high level and at low level. Where communications with the outside air is possible
only by means of high level air vents, ducting down to floor level for the lower vents(s) should be used. For
an exposed boiler house, air vents should be fitted, preferably on all four sides, but at least on two sides.
Air vents should have negligible resistance and must not be sited in any position where they are likely to be
easily blocked or flooded or in any position adjacent to an extraction system, which is carrying inflammable
vapour.
3.3 air
supply