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4.3 Insulation requirements
When the cassette is fi tted into a surround with combustible
walls protected by insulating material, the following types
and thicknesses can be used:
50 mm Jøtul JGFW-5 fireproof board (specific thermal
conductivity = λ value = 0.06 W/mK)
50 mm (min. 38 mm) Rockwool (λ value = 0.046 W/mK)
50 mm (min. 31mm) Rockwool (λ value = 0.037 W/mK)
Other materials may be used. See Fig. 33 for minimum
insulation thicknesses for known Lambda (λ) values.
Note: The insulation must be mounted in a way that doesn`t
allow heat to be conducted through the securing materials
to the combustible walls.
Fig 33
Minimum insulation thickness
Minimum Insulation Thickness
[mm]
70
60
50
40
30
20
10
0
0,02
0,03
0,04
RockWool BB Lambda 0,037
8
0,05
0,06
0,07
0,08
Lambda value [W/mK]
JGFW-5 firewall
RockWool BB Lambda 0,046
4.4 Outside air connection
Warning! You need to ensure an adequate supply of outdoor
air to the room in which the product is being installed. An
inadequate supply of air may cause smoke to be emitted into
the room. This is highly dangerous! Symptoms of this may be
the smell of smoke, feeling of tiredness, nausea and sickness.
If the house is tightly sealed and insulated and/or has a
mechanical air extraction system, the room should be fi tted
with vents or a separate duct to provide an additional supply
of outside air. Ducts in the room where the stove is installed
must be made of a non-combustible material such as a fl exible
aluminium pipe with an internal diameter of 80 or 100 mm.
A fresh air duct connector is included with the product. The
connector can be attached in three diff erent places (Fig. 2)
depending on how the duct is entering the surround or heart.
A kit for outside air connection with air duct, wall grille and
insulation is an optional extra. If outside air does not pass
through a separate duct, the lever (Fig. 27A) must be in the
open position. If the air to the product passes through an outside
air duct, the lever must be in the closed position. See Chapter
4.11 for installation of outside air connection.
4.5 Air circulation
If installing in a new fi replace surround (Fig. 2), air must be able
to circulate between the cassette and the masonry.
Min. circulation air:
Base:
350 cm2 free opening.
Top:
500 cm2 free opening.
This is a safety measure to ensure that the build-up of heat
inside the fi replace surround does not become too great and
that the output of heat to the room is adequate. If the product
is installed in an approved hearth, the opening in the base can
be omitted and the opening in the top can be 100 cm2. See
Chapter 4.6.
4.6 Hot air distribution / fan
One or two ducts with an internal diameter of 150 mm can be
connected to distribute the heated air from the cassette. Hot
air ducts must be made of a heat-resistant, non-combustible
material, for example, fl exible aluminium ducts. These can
become very hot and it is important that they do not come into
contact with any combustible material. Two connectors for the
ducts are included with the product (ducts are not included).
The problem of paint changing colour just above the cassette
is reduced by the use of hot air ducts. A fan (optional extra) can
be fi tted inside the product to increase hot air distribution. This
0,09
can be fi tted regardless of whether ducts for hot air distribution
have been installed or not. The fan should be fi tted before
the product is installed. See the instruction manual for fan
installation (included with the fan).
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