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Single wall, twin wall or flexible
!
flue liner with a minimum diameter of
125mm. The materials to be used are
stainless steel or aluminium as
specified in BS EN 1856 Part 1. The
liner must be sealed to the
surrounding area above the fireplace
opening and to the top of the chimney.
An approved terminal must be fitted.
A properly constructed precast
!
concrete or clay flue system
conforming to BS1289 or BS EN
1858. This system is only suitable if
the conditions stated in section 4.2.3
are met.
4.4
The flue must conform to BS
5440: Part 1 in design and installation.
The flue, measured from the bottom
of the fireplace opening to the bottom
of the terminal, shall be not less than
3m in actual vertical height. When
calculated in accordance with BS
5440: Part 1 Annex A, the minimum
equivalent height of the flue shall be
2.0m of 125mm-dia. flue pipe.
4.5
The flue must not be used for
any other appliance or application.
4.6
Any chimney damper or restrictor should be removed. If removal is not possible,
they must be secured in the open position.
4.7
If the appliance is intended to be installed to a chimney that was previously used
for solid fuel, the flue must be swept clean prior to installation. All flues should be
inspected for soundness and freedom from blockages.
4.8
If the fireplace opening is an underfloor draught type, it must be sealed to stop
any draughts.
4.9
The appliance must be mounted behind a non-combustible hearth unless the
conditions in section 4.2.3 are met (N.B. conglomerate marble hearths are considered as
non-combustible). The appliance can be fitted to a purpose made proprietary class "O"-
©
Baxi Heating U.K. Limited 2006.
INSTALLER GUIDE
Figure 3. Precast or clay flue block system
dimensions
Page 10
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