10
Purevision LPV Freestanding
Issue 01 02/21
COMBUSTIBLE SHELVES AND BEAMS
Due to the fact that combustible shelves, timber fireplaces and beams have potentially thousands of
possible configurations in conjunction with stoves outset or inserted partially or fully into chambers,
it is not possible to give firm guidance on dimensions to these features. As a guideline, materials that
are in ‘line of sight’ to the stove are more likely to overheat
due to direct radiation from the stove
body
than materials that are not in ‘line of sight’
(e.g. with stove fully inside a chamber). Materials
above the stove are far more likely to overheat than materials alongside or below. A guideline
limiting temperature for solid timber (not surface finishes) is approximately 80-85 degrees C with a
normal ambient room temperature. Temperatures of combustible materials can be substantially
lowered with a simple heat shield constructed of a non-combustible material and small air gap (6-
12mm for example) between the shield and combustible material.
5.6.2.
Distances from NON-combustible materials:
The stove can be recessed in a suitable sized non-combustible fireplace but a permanent free air gap
of at least 50mm must be left around the sides and top and at least 50mm at the back of the stove
to obtain reasonable heat output and for access to the stove for removal and maintenance. A
clearance of 150mm will give a better heat output
In accordance with Building regulations all non-combustible walls closer than 400mm to the stove
should be at least 75mm thick. For practical reasons the back wall of the fireplace recess and the
hearth should be made of non-combustible material.
5.7.
Hearths:
Purevision freestanding stoves do not require a constructional hearth beneath them as they do not
cause the floor temperature to exceed 100 degrees C. Hearths must be generally level. In all
instances a non-combustible superimposed hearth extending fully underneath the stove and
forming an apron of at least 225mm at the front of the stove and 150mm on either side must be
provided. The superimposed hearth must not be less than 12mm thick and must have a clearly
defined edge (change of level) to discourage placing of any combustible materials on or partially
over it.
The appliance shall be installed on a floor with adequate load-bearing capacity. If the existing
construction does not meet this requirement, suitable measures (e.g. load distributing plate) should
be provided to achieve it.
5.8.
Accessories
Purevision stoves are provided with a selection of accessories including stands, log store stands, and
a dedicated outside air kit. Only use genuine Purevision accessories.
5.9.
Commissioning and Handover
CO Alarm: Building Regulations require that whenever a new or replacement fixed solid fuel or
wood/biomass appliance is installed in a dwelling a carbon monoxide alarm must be fitted in the
same room as the appliance. Further guidance is available in BS EN50292:2002 and from the alarm
manufacturer’s instructions. Provision of an a
larm must not be considered a substitute for either
installing the appliance correctly or ensuring regular servicing and maintenance of the appliance and
chimney system.
Upon completion of the installation, allow a suitable period of time for any fire cement and mortar
to dry out. A small fire may then be lit and checked to ensure the smoke and fumes are taken from
the stove up the chimney and emitted safely to atmosphere.
