From 200mm thick non-combustible or new recesses, an
opening of 1,080mm wide minimum, by 343mm deep minimum
and 1,680mm high minimum from floor is recommended.
NOTE (SEE FIG. 1): PLEASE NOTE IT IS ADVISABLE TO
CHECK THE SIZE/WIDTH OF YOUR APPLIANCE BEFORE
FINALLY FIXING ANY KITCHEN UNITS SINCE ENAMELLED
CAST IRON CAN VARY IN SIZE.
The minimum chimney draught requirement at nominal total
heat output is 12 Pa.
The mean flue gas temperature directly downstream of the flue
spigot at nominal heat output is 247ºC.
This appliance is not suitable for installation in a shared flue
system.
The minimum clearance to combustible materials is 150mm.
Checking existing chimney
The internal and external condition of the chimney should be
checked
before
the appliance is installed and rectification
made where necessary to prevent leakage or porosity. The
soundness of the chimney which should have a minimum flue
dimension of 175mm square or 185mm diameter can be
confirmed by smoke testing. Advice on the test method can be
obtained from HETAS.
When repairing or re-using chimneys its recommended that the
building control office be consulted before the commencement
of work with particular attention to the chimney height and its
termination.
The chimney must be swept before installation.
Erecting New Chimney
The flue through the chimney should be formed with pre-cast
moisture and acid-resistant liners with a minimum internal
dimension of 185mm square and all in accordance with the
current Building Regulations (England and Wales) and in
Scotland the Building Standards (Scotland) (Consolidation)
Regulations and the Codes of Practice for chimneys and flues
BS. 6461 Part 1 and BS 7566 Parts 1 to 4.
Ensure the chimney liners are free of projecting internal
building jointing composition before the appliance is installed.
Factory made Insulated Chimneys
It is recommended the chimney be ceramic lined and comply
with BS. 4543.
The minimum diameter for a straight chimney is 175mm and if
offsets are fitted the recommended minimum diameter is
200mm.
IN ALL TYPES OF CHIMNEYS THE MINIMUM HEIGHT FOR
CORRECT OPERATION OF THE COOKER IS 4.5m AND
SHOULD TERMINATE ABOVE THE ROOF IN ACCORDANCE
WITH REGIONAL STATUTORY REQUIREMENTS.
RECOMMENDED FLUE DRAUGHT - 12 Pa MINIMUM. THE
APPLIANCE SHOULD BE INSTALLED AND CONFORM TO
THE CURRENT CODES OF PRACTICE FOR INSTALLATION
OF DOMESTIC HEATING AND COOKING APPLIANCES
BURNING SOLID FUEL - BS 8303.
ALWAYS ADVISE THE USER TO CLEAN THE COOKER
FLUES IN ACCORDANCE WITH THE OPERATING
INSTRUCTIONS AND TO HAVE THE CHIMNEY SWEPT AT
Fig. 2
Fig. 3
Fig. 4
3
THE CHIMNEY
DESN 510281 B
DESN 510282 B
DESN 510283 B
BUILDERS OPENING
