9
8. - FRET REQUIREMENTS
!IMPORTANT NOTE! THE FRET CAN AFFECT THE SAFE OPERATION OF THE FIRE
9. - FLUE REQUIREMENTS
These checks MUST be made before constructing the Builders Opening
The Appliance is suitable for Installation into the following types of Flue:
a.
Conventional Stone/Brick Built Flue (Class 1) with a minimum cross sectional dimension of 175mm (7”) with a minimum effective
height of 3 meters.
b.
The flue
MUST
be free of any obstructions. Any dampers or restrictors
MUST
be
removed. Some dampers are impractical to be
removed; therefore they
MUST
be fixed in some way in the
OPEN
position.
c.
The chimney/flue should be swept if it has been used for solid fuel.
d.
A Flue Lined with a 5” Flexible Flue Liner connected to a Register Plate fitted and sealed at the top of the Builders Opening with a
minimum effective height of 3 meters.
e.
A Pre-cast Flue with Starter Blocks conforming to BS1289: 1975, 1986, or 1989 or BS EN1858 and having a minimum cross
sectional flue of 198mm by 67mm and Starter Blocks providing 115mm deep by 304mm wide with a minimum height of 555mm.
No part of the Pre-cast Flue must be less than 63mm.
f.
The Fire may be used in conjunction with a Fully Sealed Rebated 150C rated or Equivalent Purpose Built Fire Surround.
g.
Any Pre-Cast Flue must be Sound and Free from Obstructions (Mortar Fangs or Protrusions into the Flue Way) and have an
effective height of over 3 meters.
h.
For Pre-cast Flues - ensure the walls are dry lined over the route of the flue and no dabs or battens are in direct contact with the
flue blocks otherwise wall cracking will occur as detailed in BS 5440 Pt 1 2008.
i.
A Purpose Designed Flue Box to BS715 fitted with a 5” twin walled flue with a minimum effect height of 3 meters to BS EN 1856.
Details are available from your authorised supplier.
j.
Ensure that only one fireplace is served by the flue system.
k.
Ensure that the chimney/flue is continuous from inlet to termination.
l.
Ensure that the chimney/flue is structurally sound, so that combustion products do NOT come into contact with combustible
materials outside the chimney.
m. CHECK FLUE PULL.
Apply a smoke match or smoke generator to the flue opening at hearth level and observe smoke. If
there is a definite flow into the flue aperture, proceed with installation. If there is not a definite flow into the flue aperture, preheat
the flue for approximately 10 minutes and re-test. If there is not a definite flow towards the flue aperture the flue may need
attention.
DO NOT FIT THE APPLIANCE, SEEK EXPERT ADVICE.
10. - VENTILATION
a.
No additional purpose provided ventilation is normally required for the fire when installed in the UK; however this
must
be
confirmed by the Spillage Test, see Section 18.2.
b.
For other Countries refer to National Regulations and Local Codes.
c.
This appliance is fitted with an oxygen depletion sensing system, which automatically shuts off the gas supply to the fire if the
oxygen level in the room is depleted, due to lack of primary air, or obstructed flue that would lead to incomplete combustion of the
gas. It
must not
be tampered with and only replaced with a genuine Nu-Flame ODS Pilot.
These checks MUST be made before selecting a suitable Fret
a.
The Important Minimum Open Area’s (for airflow) of the Fret are
shown in the diagram, with the minimum dimensions .
b.
The Minimum Open Area at the base of the Ash Pan Cover is
5200mm sq equally shared between two openings, they must be
at the base of the Ash Pan Cover.
c.
The Minimum Open Area in the Fender area (above Ash Pan Cover)
is 7500mm sq which can be provided through one or more slots.
d.
The correct height to the Upper most part of the Fret must be
190mm, to align with the Fuel Bed.
e.
The opening for the Ash Pan Cover area must be 85mm minimum
height to allow access for operation of the Controls.
f.
The Fret will have to be curved at the back and must be checked to
ensure it does not foul the Matrix of the Fuel Bed. It should
also touch the Trim.