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1.8 Room-air-independent operation (RAI)
In room-air-independent operation, the air is supplied from outside. It is essential to ensure that no
negative pressure of more than 8 Pa can occur when accessories such as extractor hoods and/or
ventilation systems are in use. Be sure to have an appropriate safety device installed by a specialist. If
you have chosen the room-air-independent variant of the stove, you will find a certificate and a pressure
log in the stove on delivery. If these documents are not available, this appliance must not be operated as
room-air-independent and you should contact your specialist retailer! Installation work for the outside
air connection must be carried out by a specialist.
Warning! Danger to life due to poisoning! An insufficient air supply can lead to dangerous
flue gas leakage!
The stove requires oxygen at all times for the combustion process. For each kilogram of wood, approx.
10 m
3
of air is required for clean combustion, which is supplied via the outside air connection. You can
connect the stove to the outside air using the outside air connection piece supplied (Ø 100 mm). The
combustion air can be supplied from outside or from another sufficiently ventilated room (except for
boiler rooms).
IMPORTANT:
The cables must be connected with an exact fit and sufficient overlap (insertion depth). The
connector must not have a longitudinal seam. Flexible pipes made of aluminium may also be
used; these must be protected against external mechanical damage and must not show any
impermissible deformations. If you do not use an air-exhaust chimney system, the Germany
Energy Saving Ordinance (EnEV) requires that the combustion air duct near the stove can be
shut off and that the positions (open and closed) are visibly marked. This shut-off must always
be open when the stove is in operation.
The number of bends and the total length of the air duct have a significant influence on the duct
resistance. For this reason, keep the distances short and install the duct on a direct path.
The duct length should not be longer than 5 m in total and should not have more than 2 bends
of 90°. A chimney sweep should check these air ducts. Ensure ducts to the open air have suitable
wind protection and a grille at the air inlet to offer protection against leaves, insects or similar.
Differences in temperature between the room where the stove is installed and the fresh air supplied
from outside can cause condensation to form on the air supply and air-carrying parts on the
stove. Ensure professional insulation against condensation water is in place using suitable
insulation material. Please note that the thickness of the thermal insulation must be determined
on a building-specific basis.
Warning! The combustion air supply must not be changed. Always keep the openings of
the stove free for combustion air during operation. Only use your stove and its components
if they are in perfect condition. Before using the stove, always check that the window and
door seals are undamaged, firmly seated and well sealed. Have your stove checked by
a specialist at the start of every heating season. We recommend replacing all seals and
springs once a year.
Even in room-air-independent operation, a connection to the installation room is created
by opening the firebox door when heating up or adding fuel. In this case, either the
controlled ventilation system should be switched off or else a window should be opened
in the installation room. This prevents a critical negative pressure from developing in the
installation room and flue gases from escaping.