External Air Intake Connection; Convection - Stuv 21 Installation Instructions Manual

External air intake connection

Fix a baffle as well as a 100-mm
diameter hose to the external air
intake box.
It is possible to connect this to the
back (2 positions) or the side of the
box (2 positions).
Break out the pre-cutout(s) using a
hammer.

Convection

In general
In order to ensure optimal
performance of your Stûv 21, we
recommend using the maximum
number of air inlets and outlets to
encourage convection between the
outer casing of the stove and the
combustion chamber.
Please note
Using a hammer, free at least 2 of the
6 pre-cut fresh air inlets in the bottom
part of the stove (1 left & 1 right) and
at least 2 of the 8 hot air outlets in its
upper part [photo 1].
In double-face stoves, free at least
2 of the 4 inlets and 2 of the 6 outlets.
Observe the 2/3 relationship with a
minimum of 300 cm². Therefore, if
you open 2 air intake orifices in the
bottom of the stove, you must open 2
or 3 orifices at the outlet.
(See also the "Preparation of the Site"
section > convection, page 11).
Caution !
If you are installing a fan, do not
open all of the lower air inlets but
Stûv 21 - installation [en] - 04-2013
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SN 132150- ...
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only those which will be connected
to the fan (see "Auxiliary Ventilation"
below).
If you intend to install a fan later,
initially only open the inlets where the
fan(s) will be positioned. When you
install the fan(s), the unused inlets
have to remain blocked.
Fitting ducts
Use the 10 mm socket driver to fix
the optional nozzles [photo 2].
They provide a fixing base for a
Ø150 mm flexible tube connection.
This tubing will direct hot air straight
from the hearth to an adjacent
room without carrying any dust that
could be in suspension between the
masonry and the hearth.
Please note
The air inlet and outlet grills have to
be positioned in such a way that they
cannot be obstructed.
2
Ø 100 mm
1
2