Ventilation
Make sure the ventilation in the sauna is arranged so as to guarantee enough supply air for com-
bustion and that the air in the sauna is fresh and has sufficient oxygen levels for sauna bathing.
The task of the ventilation is to also remove the humidity from the room after the sauna bath.
For combustion air, connect fresh-air duct with a diameter of 100 mm close to the sauna stove.
The grills for the supply air for the sauna must be placed so that they will not get blocked easily.
The burning consumes a lot of air, and natural ventilation will work well in wood-burning sauna as
long as there is fire in the furnace.
If the sauna space has mechanical ventilation, the supply air duct can also be placed over the
stove. In this case, install the exhaust air duct at the bottom of the sauna, preferably on the oppos-
ing wall. Air can also be exhausted from the washing room, in which case you need to leave a gap
of at least 8 cm under the door between the sauna and the washing room. When using mechanical
ventilation/exhaust fan, make sure that it will not cause excessive underpressure in the sauna
room, which may reduce the draught in the furnace and make it more difficult to light up.
Install a ventilation valve on the sauna ceiling or top of the wall. Keep it closed during the sauna
bath and then open to dry the sauna. Sufficient ventilation after sauna is necessary to guarantee a
long useful life of the sauna stove and the sauna.
Fuel
The fuel of a PARRA sauna stove is only natural chopped wood. The dimensions are shown in ta-
ble 1. The amounts of firewood used for heating the sauna stove or when adding wood are shown
in table 3. Make sure you do not fill the furnace past the top of the filling hole when you add wood.
The performance values shown in the table apply to birch firewood. Other wood can also be used.
To attain good burning, make sure that the firewood is dry.
Do not use materials with high calorific value, such as briquettes, coal, plastic or liquid fuels to
heat a PARRA sauna stove. They are specifically against the recommendations.
You can store an amount of wood suitable for a few uses close to a PARRA stove. The wood must
be placed so that its temperature will not exceed 80 °C.
Heating
Open the flue damper, if any, and empty the stove’s ash tray before heating. Use small, dry wood
for ignition. Then use the ash tray to adjust draught. At the early stages of heating, the ash tray
may be wide open. When heating, the ash tray may be open up to the 25-mm limiter. If you open
the ash tray, make sure not to burn the stove too hot. A small draught will reduce the amount of
wood needed but also prolong the time needed for heating the sauna. Usually, one full load of
wood is enough to heat up the stove. After this, add the amount of larger wood necessary to sus-
tain burning during the sauna bath.
Make sure that the supply air grills are clean and open.
If the sauna has been unused for a long time, make sure the flue is in order and open before you
light up the fire. The draught will be poor with a cold flue and under certain weather conditions. In
this case, start the fire with a small amount of wood. Closing the sauna door or windows may help
in the starting stages.
After finishing the sauna, add some wood to the firebox to burn and ventilate the sauna. This en-
sures drying of the stove and sauna. In addition, adequate ventilation must be ensured. With these
measures, you ensure the long life-time of the PARRA stove.