11
System Chimney
SUPPORT COMPONENTS
The weight of a chimney system is considerable and requires independent support. Minimal
weight should be borne by the appliance. The weight of the chimney can be supported from
floor level by using a base support plate, or floor support; from the wall by using wall support
top plates together with side plates or cantilever brackets; or from first floor level by using a
support plate and clamp fixed to the floor/ceiling joists.
Wall brackets are non load bearing and provide lateral support only. Refer to the load bearing
tables on page 40 for full details of maximum loadings.
Where the flue is freestanding above the roof and its height exceeds 1.5m above the last
support or above the roof, a height of up to 3m can be achieved unsupported using the
extended locking bands at the joint immediately below the last support and on each pipe joint
above the last support.
Alternatively guy wire brackets can be used at the 1.5m level and every 1.5m thereafter in
conjunction with guy wires, or rigid stays (provided by others).
CHIMNEY TERMINATION
For full information regarding to chimney termination, please refer to Annex M of BS EN 15287-
1. As a guide please refer to page 36 of these installation instructions.
TERMINALS
All terminals must be secured with the use of a locking band. On solid fuel appliances, an open
termination is normally recommended. However in certain conditions, rain caps or anti-
downdraught terminals may be used.
Rain caps and anti-downdraught terminals are available in three versions, with anti-bird mesh,
with spark guard, or without mesh. Where a terminal with mesh is used, there is a risk of soot
build up, and therefore regular cleaning is required to avoid blockage, particularly when using oil
or solid fuel.
