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English
RAIS - Manual for RAIS Q-Tee
ONLY USE RECOMMENDED FUELS
The following table shows the calorific value of different types of wood, which have
been stored for 2 years, and which have a residual moisture of 15-17%.
Wood
Kg dry wood pr. m
3
compared to beech/oak
Hornbeam 640
110%
Beech and oak
580
100%
Ash 570
98%
Maple 540
93%
Birch 510
88%
Mountain pine
480
83%
Fir 390
67%
Poplar 380
65%
1 kg of wood yields the same heat energy irrespective of wood type. 1 kg beech merely
takes up less space than 1 kg of fir.
Drying and storage
Drying wood takes time: proper air drying takes approx. 2 years.
Here are some tips:
Store the wood sawn, split and stacked in an airy, sunny place, which is protected
against rain (the south side of the house is particularly suitable).
Store the firewood stacks at a hand’s breadth apart, as this ensures that the air flowing
through takes the moisture with it. Avoid covering the firewood stacks with plastic, as
this prevents the moisture from escaping. It is a good idea to bring the firewood into
the house 2-3 days before you need it.
Regulating the combustion air
All RAIS stoves are equipped with a one-handed operating lever for regulating the
damper. The stove-specific regulating mechanisms can be seen on the diagrams.
Primary air is the combustion air added to the primary combustion zone, i.e. the bed of
glowing embers. This air, which is cold, is only used in the lighting stage.
Secondary air is the air which is added in the gas combustion zone, i.e. air which con-
tributes to the combustion of the pyrolysis gasses (preheated air, which is used for the
cleaner glass system and combustion). This air is sucked through the damper under the
combustion chamber and is pre-heated through the side channels and then emitted as
hot scavenging air onto the glass. The hot air rinses the glass and keeps it soot-free.
The tertiary channel, which can be seen at the top of the combustion chamber towards
the back, serves to combust the final gas residues.
