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4.2.
Flue Requirements
This appliance may be installed in fireplaces served by the following types of flue;
Class 1 Masonry Flue
- A flue having
no cross sectional dimension less than 175mm (7”) e.g.
225mm (9”) by 225mm (9”) Masonry chimney or 175mm (7”) diameter clay liner. Due to the
high efficiency of this appliance consideration should be given to lining any unlined masonry
flue with a flexible flue liner to prevent problems with condensation.
Class 2 –
A metal flue having
no cross sectional dimension less than 125mm (5”).
All metal flues must comply with the requirements of BS EN 1856 “Chimneys - Requirements
for metal chimneys - System chimney products”.
Any metal flue box must comply with BS 715 and be large enough to accept the appliance.
There must be a minimum of 50mm clearance from any combustible material; alternatively the
box may be insulated with 25mm mineral wool or equivalent. The top of the box must be
insulated with 25mm mineral wool or equivalent
.
Class 2 - Pre-cast -
A flue constructed of pre-cast concrete/terracotta blocks conforming to
BS EN 1858 or BS 1289:Part 1 and having a minimum cross sectional area of 12,272mm
2
with
the smallest dimension being no less than 63mm.
All flues require a minimum height of 3 metres (10ft). For installation in GB, please refer to
BS 5871 Part 2 for further information. For installation in IE, refer to the current edition of
I.S.813 “Domestic Gas Installations”.
A faulty flue or chimney may result in smoke and fumes entering the room.
The flue should be sound, free from obstructions and, if it has previously been used with a
solid fuel or oil fired appliance, it should be swept before installing this gas fire. The flue must
be inspected annually to ensure continued clearance of combustion products.
Any flue damper plates or obstructions etc. must be removed and no restrictor plates shall be
fitted. Where removal is not practical, the damper plate/restrictor must be fixed permanently in
the fully open position.
Note: To comply with the expression “permanently fixed in the open position”, a
mechanical fixing that prevents user intervention should be used e.g. requires the use
of tools for removal.
It is recommended that a smoke test be carried out before installation to ensure that there is
no spillage of fumes into the room. If spillage occurs this problem must be rectified before
commencing installation.
The flue must serve only one appliance.
If any terminal, cowl or chimney pot is fitted on the flue, ensure that it is suitable for use with
this gas fire and the flue system and does not restrict the cross sectional area of the flue.
Please consult the manufacturer of the terminal/cowl/chimney pot for guidance.
On completion, the installation must be thoroughly tested for spillage as detailed in the
Commissioning section of the Installation instructions.
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