Stuv 21 Installation Instructions Manual page 17

Forced convection (continuation)
The advantages and disadvantages of these 2 types of installation
Outlet ducts
– depression near the stove that risks
affecting the drawing of air.
– geometry of the layout restricted :
the ducts must always rise in a slight
gradient without any obstructions in
the route to prevent the hot air from
stagnating.
– significant drop in the air temperature
along its route (maximum 3 m).
+ easier to implement if not planned for
in the architecture or in the case of
renovation.
Air return
If you plan to have a room air inlet or
outlet in another room (distribution
across several rooms), do not forget to
create air passages of sufficient section
(at least the same) for the return :
The air which has been drawn from
or directed to a room must be able to
return there.
The abstraction of air must be offset
by a return to prevent depressions
in the room where the stove is
situated as this involves the risk of
draughtback.
In practice...
The use of ducts is mandatory to
ensure the air which comes out of the
stove does not go straight back into
the fan (short circuit - the inside of the
cladding).
Setting up the power supply
(2 conductors + ground) and the fan
controls ; the connection has to be
protected by a bipolar fuse.
Please also see the notes in the
previous section.
Inlet ducts
+ excess pressure close to the system
(encourages the drawing of air).
+ bends can be used in the ducts, reverse
gradient,... (no air stagnation).
+ no variation in room air temperature
on its route which means it can be
obtained from further away with better
direction and greater temperature
consistency in the room.
– difficult to implement if not planned in
the architecture or construction site.
Please note
To prevent the fan from affecting
combustion, do not put the
combustion air inlet and the
convection air inlet too close to one
another [diagram 7].
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Stûv 21 - installation [en] - 04-2013
SN 132150 - ...
17