HD01 18/12/11
The diameter of the flue should not be less than 125mm and not more than 200mm. If any of
these requirements are not met, the chimney should be lined by a suitable method. The chimney
must be swe t before connection to the stove.
Where the chimney is believed to have reviously served an o en fire installation, it is ossible
that the higher flue gas tem erature from the stove may loosen de osits that were reviously
firmly adhered, with the consequent risk of flue blockage. It is therefore recommended that the
chimney be swe t a second time within a month of regular use after installation. If you have any
doubts about the suitability of your chimney, consult your local dealer/stockist.
If there is no existing chimney then either a refabricated block chimney 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.
Flue Draught
A flue draught of minimum 1.2mm to a maximum 2.5mm water gauge is required for
satisfactory a liance erformance. The flue draught should be checked under fire at
high out ut and, if it exceeds the recommended maximum, a draught stabiliser must be fitted so
that the rate of burning can be controlled and to revent overfiring.
C nnecti n t the Chimney
An existing fire lace o ening can be bricked u or sealed with a register late. A short length of
flue i e of a minimum 125mm internal diameter may then be used to connect the stove to the
chimney. This flue i e should conform to Building Regulations. Ensure that the i e end is no
closer than 76mm to the side or rear chimney walls.
Ideally, the old fire lace should be filled in so that there is a smooth streamlined entry into the
flueway. The length of any horizontal run of flue i e must not exceed 125mm.
It is essential that all connections between the stove and chimney-flue are sealed and made
airtight. This a liance is not suitable for installation in a shared flue system.
Both the chimney and flue i e must be accessible for cleaning and if ANY arts of the chimney
cannot be reached through the stove (with baffle removed), a soot door must be fitted in a
suitable osition to enable this to be done.
Material Clearances
The stove can be recessed in a suitable sized fire lace but a ermanent free air ga of at least
150mm must be left around the sides and to and at least 50mm at the back of the stove to obtain
maximum heat out ut and for access to the rear of the stove.
All non-combustible walls closer than 400mm to the stove should be at least 75mm thick. In all
instances the back wall of the fire lace recess and the hearth should be made of non-combustible
material. Allow an a ron of at least 300mm at the front of the stove and 150mm on either side.
The hearth on which the stove is to be laced should not be less than 125mm thick and should be
in accordance with the current building regulations.