3.2.4
If the fireplace opening is
greater than the acceptable
dimensions given in this guide, do
not use the back of a fire surround
or marble to reduce the opening.
This may cause cracking of the
surround back or marble.
3.3
The following flues are
suitable:
!
225mm x 225mm conventional
brick flue.
If a flue liner is used, it must be a
minimum of 125mm diameter. 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
flue conforming to B.S 1289 or BS
EN 1806.
!
A flue pipe with a minimum
diameter of 127mm. See B.S 6461
Part 1 for suitable
materials. Metal flue pipes must
comply with B.S 715.
3.3.1
The minimum effective height of the flue must be 3m.
3.3.2
The flue must be clear of any obstruction and its base must be clear of debris.
3.3.3
The flue must be completely sealed so that combustion products do not come
into contact with combustible materials outside the chimney.
3.3.4
The flue must serve only one fireplace.
3.4
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.
3.5
The flue must not be used for any other appliance or application.
3.6
Any chimney dampers or restrictors should be removed. If removal is not
possible they must be fixed in the open position.
Pa ge 1 1
INSTALLER GUIDE
©
Baxi Heating U.K. Limited 2007.
Figure 3. Pre-cast fireplace
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