17
ENGLISH
Air Ventilation
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. Special
sauna grade spruce wood is essential for the walls and ceiling inside the sauna.
The inlet vent may be installed on the wall directly below the heater (Fig. 9A). When using
the mechanical ventilation, inlet vent is placed at least 60 cm above the heater (Fig. 9B) or
on the ceiling above the heater (Fig. 9C). 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.
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.
1.
2.
3.
4.
A
B
C
Kuva 9
Fig. 9
