Outside Air Connection; Air Circulation - Jotul C 24 Manuel D'installation

4.3 Insulation requirements
When the cassette is fitted 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
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 fitted
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 flexible 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 different 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 fireplace 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 fireplace 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, flexible 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
0,09
reduced by the use of hot air ducts. A fan (optional extra) can be
fitted inside the product to increase hot air distribution. This can
be fitted regardless of whether ducts for hot air distribution have
been installed or not. The fan should be fitted before the product
is installed. See the instruction manual for fan installation
(included with the fan).
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