1.7 FITTING TO FIREPLACES WITH EXISTING CHAIRBRICKS AND
CONVENTIONAL BRICKBUILT CHIMNEYS
This appliance is not suitable for use in fireplaces fitted with an existing chairbrick.
Any chairbrick must be removed prior to proceeding with the installation
1.8 FITTING TO PRE-FABRICATED TWIN WALL METAL FLUE BOXES
The appliance may be fitted to twin wall metal flue boxes conforming to the con-
structional requirements of BS 715 / BS EN 1856-2, (for example the Ritevent LFE
175 box). The box must have a minimum flue diameter of 175mm internal and
minimum internal dimensions of 130mm deep by 690mm high by 560mm wide.
There are no maximum dimensional requirements for the box. The top face of the
box must be insulated with a minimum thickness of 50mm of non-combustible
mineral wool insulation or similar material. The flue box must stand on a non-com-
bustible base of minimum thickness 12mm.
1.9
HEARTHS
This appliance must only be installed on to a concrete or non-combustible hearth.
The hearth material must be a minimum thickness of 12mm with the top surface at
least 50mm above the floor. The hearth must be fitted symmetrically about the fire
opening and have a minimum width of 760mm and a minimum projection of
300mm forwards from the fire opening.
1.10
SPILLAGE MONITORING SYSTEM
This appliance is fitted with an atmosphere sensing spillage monitoring system in
the form of an oxygen sensing burner. This is designed to shut the fire off in the
event of a partial or complete blockage of the flue causing a build up of
combustion products in the room in which the fire is operated.
The following are
important warnings relating to this spillage monitoring system
:-
1) The spillage monitoring system must not be adjusted by the installer.
2) The spillage monitoring system must not be put out of operation.
3) When the spillage monitoring system is exchanged only a complete original
manufacturers part may be fitted.
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