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7 | Requirements at the installation location EN Operating manual Fireplace inserts slied flat + II
54
Combustion air supply via direct duct (balanced flue operation)
The combustion air supply can also be fed via a direct duct from outside to the fireplace insert. For this
purpose the combustion air must be safely routed from the house’s external air connection directly to
the combustion air trunking.
The duct cross-section can be determined with the help of the pressure-volume diagram (see technical
rules of the Stove- and Air Heating Constructors Association). See Section “Min. cross-section of chim-
ney combustion air duct”. This method of connection is generally recommended.
Combustion air supply from the room (balanced flue operation)
The Austroflamm fireplace insert obtains its combustion air exclusively via the direct combustion air
trunking directly from the installation room.
For all the models described in this manual you will find the combustion air trunking on the underside
of the combustion chamber. For this reason a faultlessly working combustion air feed into the heating
chamber must be ensured. This absolutely requires the correct dimensioning of the circulating air
cross-sections, in addition to the necessary combustion air cross-section. The correct positioning of the
corresponding openings into the heating chamber is very important.
Non-compliance can cause a lack of air during combustion.
Fig.4: Combustion air trunking
The combustion air trunking must always be connected, as
otherwise no combustion air is routed into the firebox.
7.4 Combustion air duct
Combustion air ducts must be made of dimensionally stable construction materials, sealed and access-
ible for inspection and cleaning. Consideration must be given to possible condensation formation
from falling below the dew point and prevented by suitable insulation.
For combustion air ducts in buildings with more than 2 full storeys and combustion air ducts which
bridge firewalls, the ducts must be executed so that fire and smoke cannot be transmitted into other
storeys or fire sections (see state building regulations).
7.5 Chimney requirements
Before set-up or installation of the Austroflamm fireplace insert, the chimney must be checked for its
size and quality under the existing local regulations (respectively state building regulations, heating
regulations and DIN 18160, Part 1). The mathematical proof of the adequate function of the chimney
must be provided in accordance with EN 13384. Consideration must be given when making the calcu-
lation that the substantially greater quantity of air can also be safely removed when the door is open
(stoking up fuel).
The operation of your Austroflamm fireplace insert is primarily dependent upon the faultless working
of the chimney.
TIP
Care must be taken that all openings, such as openings for cleaning, of fireplace being used are
closed during operation.
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