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Technical Appendix - Flues
2. Flue or Chimney
2.1 The flue or chimney system must be in good condition.
It must be inspected by a competent person and passed for
use with the appliance before installation.
Products of combustion entering the room can cause
serious health risks.
2.2 The following must be checked:
The construction of the masonry chimneys, flue block
chimneys and connecting flue pipe system must meet the
requirements of the Building Regulations.
A flexible flue liner system can be used if certified for
use with solid fuel systems and installation complies with
manufacturer’sinstructionsandBuildingRegulations.
The flue liner must be replaced when an appliance is
replaced, unless proven to be recently installed and in
good condition.
If it is necessary to fit a register plate it must conform to
the Building Regulations.
The minimum height of the flue or chimney must be 4.5m
from the hearth to the top of the flue, with no horizontal
sections and a maximum of 4 bends. Bends must have
angles of less than 45 degrees from the vertical.
—There should be at least 600mm of vertical flue pipe
above the appliance before any bends are introduced.
Ensure the connecting flue pipe is kept a suitable
distance from any combustible material and does not form
part of the supporting structure of the building.
— The installer must ensure the flue pipe diameter is not
less than the diameter of the outlet of the appliance and
does not narrow to less than the size of the outlet at any
point in the system.
Make provision to remove the appliance without the need
to dismantle the chimney.
Any existing flue must be confirmed as suitable
for the new intended use as defined in the Building
Regulations.
The flue or chimney systems must be inspected and
swept to confirm the system is structurally sound and
free from obstructions.
If the chimney is believed to have previously served an
open fire it must be swept a second time within a month of
regular use after installation to clear any soot falls that may
have occurred due to difference in combustion levels.
The flue exit from the building must comply with local
building control rules.
—Chimney heights and/or separations may need to
be increased in particular cases where wind exposure,
surrounding tall buildings, high trees or high ground could
have adverse effects on flue draught.
Do not connect or share the flue or chimney system with
another heating appliance.
2.3 Do not connect to systems containing large voids or spaces
over 230mm square.
2.4 Suitable access must be provided to enable the collection
and removal of debris.
2.5 The flue must be swept and inspected when the appliance
is installed.
Flue Draught
The flue draught must be checked with all windows and
doors closed and any extraction fans in this, or adjoining
rooms, running at maximum speed (see Installation
Checklist for ventilation requirements).
Twin Wall Flue System
If this appliance is to be used in conjunction with a twin
wall flue system then Stovax recommend the use of
their Professional XQ range. Details of this product are
available from your Stovax retailer.
In the U.K:
*BS En 15287-1, and the requirements of Building
Regulations
**This should be done by a NACS registered (UK
only)/INFO registered (Eire only) chimney sweep,
who will issue you with a certificate.
Building Regulations Document J
Flue Plate:
Where a hearth, fireplace, flue or chimney is
provided or extended (including cases where a
flue is provided as part of refurbishment work),
information essential to the correct appliance and
use of these should be permanently posted in the
building, to meet Requirement J4 of the Building
Regulations (England and Wales), F3.12 (Scotland).
Additional:
A new factory made system that complies to EN
1856; Part 1 can be used providing installation is
to the requirements of:
i) BS 7566 Parts 1 -4
ii) the manufacturer's instructions
iii) Building Regulations.
For a guide containing information on Chimneys
and Flues contact:
The British Flue & Chimney Manufacturers’
Association,
FETA
2 Waltham Court
Milley Lane
Hare Hatch
Reading
Berkshire RG10 9TH
Tel: 0118 9403416 e-mail: info@feta.co.uk
37


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