Stove Performance & testing
Westfire UNIQ 33 & 34 have been approved in accordance with EN 13240.
Preparatory work and safety checks
Important warning
This stove must not be installed into a chimney that serves any other heating appliance. There must not be an
extractor fan itted in the same room as the stove as this can cause the stove to emit fumes into the room.
Chimney
chimney connection
Flue diameter 150mm (175cm2)
Important
: When installing the UNIQ 33 & 34 wood stoves remove steel retaining bar across flue exit. Remove bolts in
collar and remove bar, replace cast collar and bolt down securely.
In order for the stove to perform satisfactorily the chimney height must be sufficient to ensure an adequate
draught so as to clear the products of combustion and prevent smoke problems into the room.
Minimum draft: UNIQ 33, 34 stove has been tested with a draft of 12 Pa. Maximum draft 25 Pa.
Flue gas flow 6.0 g/sec.
Flue gas temperature 267°C. approximately 12 Pa.
NOTE: A chimney height of not less than 4.5 metres measured vertically from the outlet of the stove to the top of
the chimney should be satisfactory. Alternatively the calculation procedure given in BS 5854:1980 may be used as
the basis for deciding whether a particular chimney design will provide sufficient draught.
The outlet from the chimney should be above the roof of the building in accordance with the provisions of Building
Regulations Approved Document J.
If installation is into an existing chimney then it must be sound and have no cracks or other faults which might allow
fumes into the house. Older properties, especially, may have chimney faults or the cross section may be too large i.e.
more than 160 mm x 160 mm. Remedial action should be taken, if required, seeking expert advice, if necessary. If it is
found necessary to line the chimney then a flue liner suitable for solid fuel must be used in accordance with Building
Regulations Approved Document J.
Any existing chimney must be clear of obstruction and have been swept clean immediately before installation of the
stove. If the stove is fitted in place of an open fire then the chimney should be swept one month after installation to
clear any soot falls which may have occurred due to the difference in combustion between the stove and the open fire.
If there is no existing chimney then either a prefabricated block chimney in accordance with Building Regulations
Approved Document J or a twin walled insulated stainless steel flue to BS 4543 can be used. These chimneys must be
fitted in accordance with the manufacturer’s instructions and Building Regulations.
A single wall metal flue pipe is suitable for connecting the stove to the chimney but is not suitable for using for the
complete chimney. The chimney and connecting flue pipe must have a minimum diameter of 150 mm and its
dimension should be not less than the size of the outlet socket of the stove.
Stove model
Weight
Nominal heat output
Wood <20%
smokeless fuels
UNIQ 33
118 kg
6.1 KW
N/A
UNIQ 34
124 kg
6.1 KW
N/A
Any bend in the chimney or connecting flue pipe should not exceed 45°. 90° bends should not be used.
If it is found that there is excessive draught in the chimney then either an adjustable flue damper or alternatively
a draught stabiliser should be fitted. The adjustable flue damper should not close off the flue entirely but should
in its closed position leave a minimum continuous opening free area of at least 20 % of the total cross sectional
area of the flue or flue pipe.
Adequate provision e.g. easily accessible soot door or doors must be provided for sweeping the chimney and
connecting flue pipe.
distance to combustible materials
Combustible materials should not be located where the heat dissipating through the walls of fireplaces or flues
could ignite it. Therefore when installing the stove in the presence of combustible materials due account must be
taken of the guidance on the separation of combustible material given in Building Regulations Approved Document J
and also in these stove instructions.
Hearth
The hearth should be able to accommodate the weight of the stove and its chimney if the chimney is not
independently supported.
The Westfire UNIQ 33, 34 wood stove has been tested and is suitable to be installed on a 12mm non combustible
plate such as Westfire 12mm glass plates or 20mm slate plates. Installation of all hearths should comply in size
and construction so that it is in accordance with the provisions of the current Building Regulations Approved
Document J.
The clearance distances to combustible material beneath, surrounding or upon the hearth and walls adjacent to
the hearth should comply with the guidance on the separation of combustible material given in Building Regulations
Approved Document J and also in these stove instructions.
If the stove is to be installed on a wooden floor, it must be covered with a non-combustible material at least
12mm thick, in accordance with Building Regulations Approved Document J, to a distance of 30 cm in front of the
stove and 15 cm to each side measuring from the door of the combustion chamber.
Combustion air supply
In order for the stove to perform efficiently and safely there should be an adequate air supply into the room in
which the stove is installed to provide combustion air. This is particularly necessary if the room is double-glazed
or a flue draught stabiliser is operating in the same room as the appliance. The provision of air supply to the
stove must be in accordance with current Building Regulations Approved Document J. An opening window is not
appropriate for this purpose. Air inlets must be positioned in such a way that they cannot be blocked. An air inlet
may be a vent (the vent must be open and the capacity of the vent sufficient when the stove is lit) or a fresh air
system linked to the stove.
The UNIQ 33 & 34 are available with a closed air supply collar (additional item) this enables the stove to take
combustion air directly from outside with a 100 mm pipe from the stove.
There are no European rules regarding the minimum distance to non-flammable walls, Westfire recommend leaving a
gap of at least 10 cm behind and to sides of stove.
UNIQ 33,34 side glass
Distances to flammable materials/furniture
1000 mm
Distance to combustible materials side std/sideglass
350/450 mm
Distance to combustible materials rear
200 mm
