Combustion Air Supply Via A Direct Duct; Combustion Air Duct; Demands On The Chimney; Connecting Pieces / Flue Pipe - Austroflamm 65x Montagehandbuch

FIREPLACE INSERTS / SLIDING DOOR
2.3

Combustion air supply via a direct duct

The combustion air supply can also be fed to the fireplace insert via a direct duct from outside. For this purpose, the
combustion air must be safely conducted from the outside connection of the house directly to the fireplace.
With the help of the work diagram (see Technical regulations of the furnace and air heating construction trade), the pipe
cross section can be determined (see also 4.1 Minimum cross sections). This method of connection is generally
recommended.
2.4

Combustion air duct

Combustion air ducts must be made of dimensionally stable building materials, and must be leak-proof and accessible
for inspection and cleaning. The possibility of condensate formation due to the temperature falling below the dew point
must be taken into account, and prevented by suitable insulation.
In the case of combustion air ducts in buildings with more than two full storeys and combustion air ducts bridging fire
walls, the ducts must be designed in such a way that fire and smoke cannot be transferred to other storeys or fire com-
partments (see state building regulations).
2.5

Demands on the chimney

Before setting up or installing the Austroflamm fireplace insert, the size and quality of the chimney must be checked
according to the applicable local regulations (respective state building regulations, combustion regulations and DIN
18160, part 1). Mathematical proof that the chimney is sufficiently functional must be provided according to DIN EN
13384. The calculation must make it possible for the much larger volume of air produced when the door is open (piling
up the fire) to be safely discharged.
The proper function of the fireplace insert depends on the connection to the correct chimney.
It must be ensured that all apertures leading to the same chimney, such as chimney cleaning apertures, are closed.
Multiple flues:
All Austroflamm fireplace inserts in these instructions are tested and approved according to DIN EN 13229 with self-
closing door (designation A1). Appliances that are to be operated exclusively with a self-closing door can be connected
to a chimney with multiple flues (if these are possible). The calculation is made according to DIN EN 13384 part 2.
CAUTION:
Multiple flues are generally prohibited for appliances operated with a balanced flue system!
2.6

Connecting pieces / flue pipe

The connecting piece must be dimensioned appropriately in accordance with DIN EN 13384.
A steel smoke pipe with a minimum wall thickness of 2 mm must be used for the heating gas pipe between the fireplace
insert and the secondary heating surface as well as the connecting piece to the chimney. In the case of austenitic, stain-
less steel, however, it only needs to be 1 mm thick.
The connecting piece must be connected directly to the chimney.
The connecting piece inside the cladding must be covered with at least 3 cm thick, dimensionally stable, non-combus-
tible insulation materials of Class A1 in accordance with DIN 4102, as described in the section Insulation layers.
This does not apply to such connecting pieces which are intended for heating convection air, and where there is other-
wise no risk of fire.
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