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The minimum chimney draught requirement for the
200SFW at nominal total heat output is 2.5 Pa.
The minimum chimney draught requirement for the
212SFW at nominal total heat output is 12 Pa.
The mean flue gas temperature of the Rayburn
200SFW directly downstream of the flue spigot at
nominal heat output is 131ºC.
The mean flue gas temperature of the Rayburn
212SFW directly downstream of the flue spigot at
nominal heat output is 210ºC.
The appliance is not suitable for installation in a shared
flue system
Checking Existing Chimney
The internal and external location 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 150mm can
be confirmed by smoke testing.
Advice on the test method can be obtained from
HETAS Ltd.
When repairing or re-using existing chimneys it is
recommended that the building control officer 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 diameter of 150mm diameter 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: Part 2.
The minimum diameter for a straight chimney is 150mm
and there should be not more than two bends of 45º
from vertical.
4
THE CHIMNEY
Fig. 2
Fig. 3
Fig. 4
DESN 510181 C
DESN 510182 C
DESN 510183 C