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FLUES
Flues should be vertical wherever possible and
where a bend is necessary, it should not make an
angle of more than 37.5
Horizontal flue runs should be avoided except in the
case of a back outlet appliance, when the length of
the horizontal section should not exceed 300mm.
FLUE PIPES
A flue pipe should only be used to connect an appli-
ance to a chimney and should not pass through any
roof space.
Flue pipes may be of any of the following materials:
(a) Cast iron as described in BS 41: 1973 (1981),
or
(b) Mild steel with a wall thickness of at least 3mm,
or
(c) Stainless steel with a wall thickness of at
least 1mm and as described in BS EN 10095:
1999 Specification for stainless and
heat resisting steel plate, sheet and strip, for
Grade 316 S11, 316 S13, 316 S16, 316 S31,
316 S33, or the equivalent Euronorm 88-71
designation, or
(d) Vitreous enamelled steel complying with BS
6999: 1989.
Flue pipes with spigot and socket joints should be fit-
ted with the socket uppermost.
CHIMNEY
The Ashling is a radiant room heater and must be
connected to a chimney of the proper size and type.
The chimney must have a cross-sectional area of at
least 30 square inches 18150sq. mm or a diameter
of at least 6" (150mm). It is best to connect to a
chimney of the same size, as connection to a larger
size may result in a somewhat less draught.
Do not connect to a chimney serving another appli-
ance. Minimum chimney height 15' (4.1 meters)
from floor on which stove is installed. An existing
masonry chimney should be inspected and if neces-
sary repaired by a competent mason. The stove
Fig.3
o
with the vertical.
must be connected to a chimney with a minimum
continuous draft of .06" wg. Poor draft conditions
will result in poor performance.
Chimneys for use with solid fuel appliances should
be capable of withstanding a temperature of 1100
without any structural change which would impair
the stability or performance of the chimney.
DOWN DRAUGHTS
However well designed constructed and positioned,
the satisfactory performance of the flue can be
adversely affected by down draught caused by near-
by hills, adjacent tall buildings or trees. These can
deflect wind to blow directly down the flue or create
a zone of low pressure over the terminal. A suitable
anti-down draught terminal or cowl will usually effec-
tively combat direct down blow but no cowl is likely
to prevent down draught due to a low pressure zone.
VENTILATION & COMBUSTION AIR
REQUIREMENTS
This appliance is rated at no more than 8kW. It is
imperative that there is sufficient air supply to the
stove in order to support correct combustion. The air
supply to this appliance must comply with B.S. 8303:
Part 1and current Building Regulations. The mini-
mum effective air requirement for this appliance is
2
16.5cm
.
If a draught stabiliser is used then this increases to
2
40.5cm
. When calculating combustion air require-
ment for this appliance use the following equation: a
total free area of at least 550mm
output above 5kW shall be provided. If there is
another air using appliance fitted in the same or
adjacent room, it will be necessary to calculate addi-
tional air supply. All materials used in the manufac-
ture of air vents should be such that the vent is
dimensionally stable and corrosion resistant.
The effective free area of any vent should be ascer-
tained before installation. The effect of any screen
should be allowed for when determining the effective
free area of any vent.
Air vents direct to the outside of the building should
be located so that any air current produced will not
pass through normally occupied areas of the room.
An air vent outside the building should not be locat-
ed less than the dimensions specified within the
Building Regulations from any part of any flue termi-
nal.
These air vents must also be fire proofed as per
Building Regulations.
3
o
C
2
per kW of rated
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