7
2.4
The appliance is suitable for the following flue duct arrangements:-
i.
A straight horizontal run up to a maximum of 4.5m.
For normal timber
frame buildings a straight run will not be possible. See section 2.5.
ii.
A horizontal run up to a maximum of 3m including one or two bends.
Minimum wall thickness 90mm.
iii.
A vertical run up to a maximum of 3m (two bends are required for a
vertical installation). Minimum wall thickness 90mm.
The above run lengths are the total measurements from the rear of the fan box to the duct
connection at the side of the appliance
The flue duct can be fitted to either side of the appliance.
Figure 1 shows the critical installation dimensions
2.4.1
The standard appliance is supplied with a total of 3m of straight ducting.
The following optional extra kits are available:
Kit No. 517IBK -
Internal elbow bend kit
Kit No. 517EBK -
External elbow bend kit.
Kit No. 517 FDK -
1.5m extra flue duct length with covers.
Kit No. 517DK
-
1.5m extra flue duct length without covers.
2.5
This appliance is suitable for installation in conventional buildings
constructed of brick, stone etc. and in timber framed buildings.
2.5.1
Installation in timber framed buildings should be in accordance with the
relevant sections of The Institute of Gas Engineers publication IGE/UP/7 “Gas
installations in timber frame buildings”.
Please note that advice should be sought
before installing in a timber frame building since the alterations required may
nullify any NHBC cover relating to the property. If in doubt, guidance should be
requested from your local authority planning or building department.
In timber framed installations an annular non-combustible sleeve should be
fitted around the flue tube where it passes through the combustible inner wall.
There should be a minimum 25mm air gap between the flue tube and the
sleeve. The gap shall be sealed to prevent the passage of air, heat and moisture.
The space between the flue ducts and the wall on which the appliance is
mounted is less than 25mm. Elbow bends will therefore be necessary to allow
the annular sleeve to clear of the wall on which the appliance is mounted.
2.6
This appliance must be mounted with a non-combustible hearth (n.b
conglomerate marble hearths are considered as non-combustible). The fire box
must be mounted on a non-combustible surface. The hearth must project at
least 345mm forward of the convection box front and be at least 620mm wide
(See figure 1). The hearth material must be at least 12mm thick. The periphery
of the hearth (or fender) should be at least 50mm above floor level to discourage
the placing of carpets or rugs over it.
The surface of the hearth must be sufficiently flat to enable the bottom of the
front surround, the burner bracket and the bottom front cover casting to be
aligned horizontally. Any excessive unevenness (uneven tiles, Cotswold stone,
etc.) should be rectified.
The appliance must not stand on combustible materials or carpets.
