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Worcester-Bosch Greenstyle Hanbury Manual

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196720819898 C 11/2017
INSTALLATION
FACTORY BUILT CHIMNEY
When a metal prefabricated chimney is used, the manufacturer’s
installation instructions must be followed. You must also purchase
(from the same manufacturer) and install the ceiling support
package or wall pass-through and “T” section package, restops
(where needed), insulation shield, roof ashing, chimney cap, etc.
Maintain proper clearance to the structure as recommended by the
manufacturer. The chimney must be the required height above the
roof or other obstructions for safety and proper draught operation.
Ways of meeting the requirements when proposing factory-made
metal chimneys include:
• Using component systems appropriately designated in
accordance with BS EN 1856-1:2003 to suit the appliance
and installing them in accordance with the relevant
recommendations of BS EN 15287-1:2007
Where a factory-made metal chimney passes through a wall,
sleeves should be provided to prevent damage to the ue or
building through thermal expansion. To facilitate the checking of
gas tightness, joints between chimney sections should not be
concealed within ceiling joist spaces or within the thickness of walls.
When providing a factory-made metal chimney, provision should
be made to withdraw the appliance without the need to dismantle
the chimney.
Factory-made metal chimneys should be kept a suitable distance
away from combustible materials. Ways of meeting the requirements
for chimneys designated to BS EN 1856-1:2003 comprise:
• Locating the chimney not less than distance ‘xx’ from
combustible material, where ‘xx’ is dened in BS EN 1856-
1:2003 as shown in the diagram below.
• Where a chimney passes through a cupboard, storage space
or roof space, providing a guard placed no closer to the outer
wall of the chimney than the distance noted above.
Non-combustible
plate with spacer,
e.g. manufacturer’s
fire stop component
No combustible material in
shaded zone. Width of
shaded zone at least equal to
manufacturer’s declared
minimum distance (xxmm) as
designated to BS EN 1856-1
Distance xx
Plasterboard
Timber
The separation of combustible material from a factory-made metal chimney designated to BS EN 1856-1:2003
USE OF FLEXIBLE METAL FLUE LINERS FOR THE RELINING OF CHIMNEY
A way of relining an existing chimney would be to use a exible
metal ue liner, appropriately designated in accordance with BS EN
1856-2:2004 to suit the appliance, fuel and ue gas characteristics.
Flexible ue liners should only be used to reline an existing chimney
and should not be used as the primary liner of a new chimney.
Always follow the manufacturer’s instructions when installing the factory built chimney system and related components. Document
J can also be a good reference for installation. All local codes must be followed during installation.
… 19 …


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