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.
Extractor Fan Warning:
There must not be an extractor fan fitted in the same room as the stove as this can
cause the stove to emit fumes into the room. If unavoidable the appliance must be checked with Approved
Document (A.D.) 1.21 and necessary action taken
Action may have to be taken if other heating appliances are in the same dwelling to make sure the correct
ventilation applies.
2.5 The Clean Air Act 1993 and Smoke Control Areas
Under the Clean Air Act local authorities may declare the whole or part of the district of the authority to be
a smoke control area. It is an offence to emit smoke from a chimney of a building, from a furnace or from
any fixed boiler if located in a designated smoke control area. It is also an offence to acquire an
"unauthorised fuel" for use within a smoke control area unless it is used in an "exempt" appliance
("exempted" from the controls which generally apply in the smoke control area).
In England appliances are exempted by publication on a list by the Secretary of State in accordance with
changes made to sections 20 and 21 of the Clean Air Act 1993 by section 15 of the Deregulation Act 2015. In
Scotland appliances are exempted by publication on a list by Scottish Ministers under section 50 of the
Regulatory Reform (Scotland) Act 2014. Similarly, In Northern Ireland appliances are exempted by
publication on a list by the Department of Agriculture, Environment and Rural Affairs under
Section 16 of the Environmental Better regulation Act (Northern Ireland) 2016. In Wales appliances are
exempted by regulations made by Welsh Ministers.
Further information on the requirements of the Clean Air Act can be found here:
https://www.gov.uk/smoke-control-area-rules
Your local authority is responsible for implementing the Clean Air Act 1993 including designation and
supervision of smoke control areas and you can contact them for details of Clean Air Act requirements.
This stove has been recommended as suitable for use in smoke control areas when burning wood logs. The
appliance has been fitted with a modification to fix the air controls at 2mm open in its minimum position.
All MI-Fires stoves are factory fitted with the Smoke control modification in place.
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