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Figure 3.
If the sauna heater is installed on a floor made of
combustible materials, an installation base must be used.
A piece of sheet metal must be installed in front of the
installation base, which extends at least 100 mm over the
sides of the heater hatch and at least 400 mm in front of
the sauna heater. The sheet metal edges facing the sauna
heater must be turned up, so that coal cannot get under
the installation base.
Please observe that the safety clearance of an uninsu-
lated smoke flue from structures made of combustible
materials is 1000 mm or any other distance stipulated in
the manufacturer’s instructions.
2.3.2 Non-combustible structure
If the wall is masonry or other structure classified as non-
combustible, it is sufficient to have a 50 mm air gap bet-
ween the upright surfaces and the wall.
2.4 Smoke flue
A smoke flue of the sauna heater must meet the require-
ments of class T600 irrelevant of the material of the smoke
flue. The minimum recommended draft of the smoke flue
is 12 Pa.
A modular smoke flue must meet the requirements of
class T600 and provided with CE-marking. When installing
a modular smoke flue safety clearances stipulated in the
installation manual of the smoke flue shall be followed. The
minimum recommended diameter of a modular smoke flue
is 120 mm. The weight of the smoke flue must not cause
load on the sauna heater. The sauna heater should be con-
nected to a separate smoke flue. A smoke flue made of
bricks must be at least the so-called half-brick smoke flue.
2.5 Ventilation
Ventilation of the steam room should be sufficiently effi-
cient and should function so that fresh incoming air is ro-
uted as close to the sauna heater as possible. Also proper
air circulation has to be provided in the steam room during
using the sauna so that air can exit from under the sauna
bench or from under the door of the washing room (suffi-
cient gap).
Extraction fans working in the same room as the firebox
may cause problems. Incoming air inlets should be located
so that they do not get blocked (for instance because of
snow). A firebox needs combustion air in a volume of 6–10
m3 per kilo of fired wood. The diameter of the ventilati-
on opening must be at least 100 mm. Forced air system
should be built according to the design prepared by the
designer of the heating, water and ventilation systems.
After using the sauna there shall be a possibility to ventilate
and dry the sauna rooms so that air exits via the upper part
of the steam room.
