III. CHIMNEY
The chimney height must be no less than 4 metres (13ft), measured vertically from the top of the stove to
the top of the chimney. It should terminate at least 1 metre above roof level.
Optimum internal dimensions of the chimney should be 175mm (7”) or 200mm (8”) either square or
round, and must not be less than 125mm (5”) in diameter.
This appliance must be installed into a ‘Class 1 Chimney’ (insulated metal). Installation with an older
chimney is a potential fire hazard.
Prior to installation, existing chimneys must be swept and examined by a competent person to ensure
safety and suitability. The chimney must be in good condition with no cracks or blockages.
If the chimney is in poor condition or covers an excessive cross-sectional area, seek expert advice from a
qualified, HETAS approved chimney engineer. It may be necessary to have the chimney lined with a solid
fuel compatible liner.
Where the chimney is believed to have previously served an open fire installation, it is possible that the
higher flue gas temperature from a closed appliance may loosen deposits that were previously firmly
adhered. This can result in flue blockage. In this instance, the chimney must be swept a second time within
a month of regular use after installation.
If there is no existing chimney, a prefabricated block chimney or a twin walled, stainless steel flue
to BS.4543 can be used either internally or externally. This must be fitted in accordance with the
manufacturer’s instructions and Building Regulations. It must also be tested to HETAS requirements. Seek
expert advice from a qualified, HETAS registered chimney engineer.
IV. FLUE CONNECTION
WARNING: The flue pipe diameter must not be less than the diameter of the outlet of the appliance.
Avoid using bends greater than 45 degrees to the vertical.
WARNING: All joints in the flue system must be effectively sealed. Check the appliance for soundness of
seals between castings and main components prior to use.
The stove must be connected to the chimney using a 5” diameter flue pipe and is supplied ready for
top or rear flue connection. It is important that the connector pipe is made from 24-guage steel or cast
iron and is more than 18” away from any combustible wall or ceiling. Please follow the manufacturer’s
instructions for passing through walls and ceilings.
The stove is designed to connect to a flue system such as masonry or pre-manufactured lined pipe system
that meets Building Regulations. If you intend to use existing masonry chimney it is important to check
for cracks in the liner. If the masonry flue is not to specification the flue should be lined with a Class 1
stainless steel liner.
Any existing stainless steel liner should be carefully checked for buckling, warping or cracks prior to
installing your stove. It is also necessary to clean your liner and chimney using a qualified, HETAS
approved chimney sweep.