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To have a soothing sauna, there should be a proper mixing of hot and cold air inside the
sauna room. Another reason for ventilation is to draw air around the heater and move the
heat to the farthest part of the sauna. The positioning of the inlet and outlet vents may vary
depending on the design of the sauna room or preference of the owner.
The inlet vent may be installed on the wall directly below the heater (Fig. 10A). When using the
mechanical ventilation, inlet vent is placed at least 60 cm above the heater (Fig. 10B) or on the
ceiling above the heater (Fig. 10C). Through these positions, the heavy cold air that is blown
into the sauna is mixed with the light hot air from the heater, bringing fresh air for the bathers.
The inlet and the outlet vent must have a diameter of 10cm.
The outlet vent should be placed diagonally opposite to the inlet. It is recommended that the
outlet vent is placed under the platform in a sauna as far as possible from the fresh air vent. It
may be installed near the floor, or led outside through a pipe from the floor going to a vent to
the sauna ceiling, or under the door (to the washroom). In this case, the sill slot must be at
least 5 cm and it is recommended that there is mechanical ventilation in the washroom. The
size of the exhaust should be twice that of the inlet.
Abb. 10
Fig. 10
Air Ventilation
A
B
C
Insulation
The sauna must have proper insulation on the walls, ceiling and door. One square meter (m²)
of uninsulated surface increases the cubic volume by approximately 1,2m³ when determining
the power requirement of the heater. Refer to Fig.8.
Ensure that moisture proofing is appropriate in sauna room. The purpose of this is to prevent
spreading of moisture to the other rooms or wall structure. Moisture proofing must be placed
between heating insulation and panel. Nordic spruce wood is recommended for the walls and
ceiling inside the sauna.
Thermal and moisture proofing need to be installed according to the following order from
outside to inside.
The recommended minimum thickness of the thermal insulation in the walls is 50 mm and
in the ceiling 100 mm.
It is possible to use carton- or aluminum foil laminate as a vapor barrier, which is affixed
over the insulation aluminum foil inwards.
Leave at least 20 mm air slot between vapor barrier and inside panel
To prevent gathering of the moisture behind the panel leave the slot between wall panel
and ceiling.
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