16
15.1 - SLIPS & WALL COVERINGS
It is essential to use marble, slate or stone slips, fitted around the builders opening. The slips must have a temperature rating of 150
º
C
and be 20mm (min) thick and typically form a border round the opening of 100mm. In order to direct the flow of heated air away from
the wall we recommend that a non combustible shelf (lip) is fitted above the top slip, protruding 30mm beyond the front face of the slip
– see diagram in Section 15.3 on the following page.
With any form of heating appliance convection air will rise up through the fire carrying particles of dust that will in time result in
varying degrees of wall staining. The non-combustible shelf is designed to minimise this by deflecting the airflow away from the wall.
However, over time some staining might occur and we therefore suggest not using patterned paper around the fire.
Due to the heat output of The Hotbox H.E. it is
not recommended
to use blown vinyl wall covering around the fire.
Where the Chimney Breast is made of Stone or Slate or other Suitable Non Combustible Material with NO wall coverings then Slips
are Not Required but the Dimensions of the Builders Opening must be as shown below and a Flat Surface of at least 65mm must be
provided around the opening for sealing.
For Hole in the Wall fires it is recommended that a means (tactile separator/shelf or guard) is provided to give abrupt warning to a per-
son moving inadvertently towards the fire.
15.2 -
HOLE IN THE WALL APPLICATION (USING MARBLE SLATE OR STONE SLIPS & SHELF)
IMPORTANT NOTE !
Dry lined walls – ensure that any air gaps between the back of the plasterboard and wall are
sealed around the builders opening or fireplace as this can affect flue pull and wall staining.
a.
It is recommended that a qualified builder constructs the
builders opening.
b.
It is recommended that a lintel is fitted above the builders
opening.
c.
The builders opening must be constructed from
Non-combustible materials.
d.
No
combustible materials must be present in the builders
opening.
e.
The base of the builders opening must be flat, level and
square to the wall and be at least 12mm thick.
f.
The builders opening should have provision for a gas supply
through the rear, see Section 11 Gas Supply.
g.
There must be a flat surface around the builders opening of
sufficient area to enable the slips to be securely fitted. The
slips should be fitted to the wall in such a way that they form
a seal to stop air from the room being drawn behind the slips
into the builders opening. We recommend a high
temperature silicon sealant.
h.
The
recommended
height for the base of the Builders
Opening is 320mm above floor level. The
minimum
height
for the base of the Builders Opening is 250mm above floor
level.
i.
High Level and Thermatronic controlled models are fitted with
Electronic Equipment, which are sensitive to dampness and
high humidity so it is very
important
that any rendering/building
work is allowed to thoroughly dry out before Installation.
15. HOLE IN THE WALL APPLICATIONS INTO CLASS 1 or LINED FLUE
BUILDERS OPENING
Builders Opening for Hole in the Wall
application (when using marble, slate or
stone slips)