Manual Worcester-Bosch Greenstyle Bewdley (page 20 of 36) (English)

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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.

20 6720818040 C 11/2017

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Worcester-Bosch Greenstyle Bewdley Manual

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