User Manual

7
MI-Fires freestanding stoves do not require a
constructional hearth beneath them as they
do not cause the floor temperature to exceed
100° C.
Your hearths must be generally level. In all
instances a non-combustible superimposed
hearth extending fully underneath the stove
and forming an apron of at least 400mm at
the front of the stove and 150mm on either
side must be provided.
The superimposed hearth must not be less
than 12mm thick and must have a clearly
defined edge (change of level) to discourage
placing of any combustible materials on or
partially over it.
The appliance shall be installed on a floor
with adequate load-bearing capacity. If the
existing construction does not meet this
requirement, suitable measures (e.g. load
distributing plate) should be provided to
achieve it.
WARNING: Extra fuel should not be stored
on or next to the appliance. Only keep
enough fuel for immediate use nearby and
never leave the appliance unattended for
long periods with any combustible material
in close proximity.
2.3 Flue Requirements
Please ensure that all local rules and
regulations are complied with, including
CE marking of the flue pipe. Additionally,
distance requirements to flammable material
for the pipe must be respected.
The optimum combustion is achieved at a
constant chimney draft of 10-14 Pascal (Pa)
measured in the flue pipe above the stove.
However, with natural draft the draft in the
chimney will be between 18-25 Pa when
conditions are optimum.
There are many factors that affect the chimney
draft, including the outside temperature,
wind strength, and surrounding buildings.
The minimum flue height requirement is
4.5 metres, if this cannot be achieved you will
have to seek the advice of a flue and chimney
specialist to carry out a BS EN13384 Chimney
Calculation to see if the chimney will work.
If the stove is being fitted into a brick chimney
or clay / concrete chimney it must be swept
before installation and checked for soundness
and suitability.
The chimney must also be free from cracks
and blockages. We advise you take the advice
of a registered chimney sweep on this matter.
In all cases we recommend the use of a
stainless steel MI-Flex liner when retro fitting
into an existing fire place, as this will help give
you the optimal flue draft required to operate
your stove correctly.
If the stove is fitted in place of an open fire and
no flue liner is fitted 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.
The connection to the existing chimney
can be made with CE marked BS EN 1856-
2 connecting pipe made from vitreous
enamel or 316 stainless steel with a minimum
thickness of 0.6mm.
If no chimney is present the use of an EN1856-
part 1 chimney system is required. Example:-
MI-Flues TWPro.
The chimney and connecting flue pipe must
not narrow to less than the size of the outlet
socket of the stove at any point.
This appliance must not be used in a shared
flue system
The minimum flue draft is 12 Pascal’s at
nominal output.
2.4 Ventilation / fresh air supply
In order for the wood burning stove to function
at optimum efficiency, air is needed for the
combustion process. There must be sufficient
fresh air coming into the room containing the
wood burning stove. In very well-insulated
houses, or houses with powerful cooker
hoods and/or air conditioning systems, a
vacuum can be created around the wood
burning stove, leading to smoke leakage and
poor combustion.
In normal scenarios this stove complies with
the guidance given in approved Document
J of the Building Regulations that states that
purpose provided ventilation is not required
in England and Wales unless the appliance
nominal rated output is greater than 5kW.