Yrittäjäntie 14, FI-27230 Lapland • phone +358 207 416 740 • fax +358 207 416 743 • www.narvi.fi
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ing is insulated and the insulation is protected with rust-
proof sheet metal. The firebox is made of fireproof mass
and cast elements. The stone compartment is lined with
firebricks. The firebox hatch, the grate and inner lid are
made of cast iron.
The sauna heater stones are included
in the delivery.
1.3 Sauna heater stones
Suitable sauna heater stones are ceramic and olivine
stones.
1.4 Area of the steam room
If the walls of a steam room are made of uncovered brick
or concrete add 0.8–1.5 m3 per square meter of such wall
and the final choice of the heater shall be made based on
the sum of the area.
If the heater is installed in a sauna that is normally not
heated or the sauna is made of massive logs, multiply the
sauna area with 1.5 and choose the heater based on this.
For sauna heaters AK 57K–AK 110 the recommended
height of the sauna is 2700 mm as a minimum, so the
sauna bench remains high enough from the surface of the
sauna heater. A space with a minimum size of one meter
must be left in front of the sauna heater to facilitate main-
tenance of the firebox.
1.5 Substrate
AK sauna heaters must be installed on a stable, fireproof
base. NB! The surface temperature of the floor tiles under
the sauna heater may increase to 250° C. Such tempera-
ture may damage the moisture barrier if it is installed under
the sauna heater or the underfloor heating.
1.6 Smoke flue
NB! When connecting the sauna heater with the smoke
flue it has to be ensured that no excessive load is ap-
plied on the sauna heater.
MASONRY SMOKE FLUE
According to the requirements of part E3 of the Building
Act concerning smoke flues, a masonry smoke flue must
be the so-called half-brick flue, the minimum length of
which measured on the smoke heater is 3 meters.
MODULAR FLUE
A modular flue must meet the requirements of class T600
and provided with CE-marking. When installing a modular
flue safety clearances stipulated in the installation manual
of the flue shall be followed.
The diameter of the modular flue shall be 150 mm.
1.7 Safety clearances to combustible
structures
Safety clearances of wood-burning sauna heaters to com-
bustible structures without additional shielding:
AK-47 / AK-57 / AK-57K
Front surface
1 000 mm
Side surfaces
500 mm *
Back surfaces
500 mm *
Top surface
1 200 mm **
*) The safety clearance can be reduced by 50% when a
single light protective screen is used and by 75% when a
double light protective screen is used.
**) The safety clearance can be reduced by 25% when a
single light protective screen is used.
A single light protective
screen can be made of a non-
combustible, fibre-reinforced cement plate that is at least
7 mm thick or a metal plate that is at least 1 mm thick,
which is attached to the wall sufficiently tight. An air gap of
at least 30 mm must be left between the protective screen
and the plate.
A double protective
screen can be made of two 7 mm
thick non-combustible, fibre-reinforced cement plates or
two metal plates with a minimum thickness of 1 mm. The
plates are fastened with screws to the base and if required
also with one another. An air gap of at least 30 mm must be
left between the protective screen and the plate and also
between both plates.
1.8 Fuel
Dry and clean wood must be used as fuel. Both hardwood
and softwood can be used to heat the sauna heater. Dry
wood heats the sauna heater the best and ensures the
best efficiency.
Chipboard, fibreboard, painted and treated wood, waste
and plastics are
not allowed to be used as fuel.
