22
A
B
C
D
15°
E
F
If necessary, increase the inlet cross-section of the air intake,
which must be built at a height close to the floor and always
protected with an external bird-proof grate and in such a way
that it cannot be obstructed by any object.
It is possible to connect the air required for combustion directly
to the external air intake, with a pipe of at least Ø 50 mm, with
a maximum length of 3 linear metres; each bend in the pipe
should be considered equivalent to one linear metre. For the
pipe connection, see rear of stove.
For hermetically sealed stoves installed in
studios, bedrooms and bathrooms (where
permitted), the connection of combustion air
to the outside is mandatory. Particularly for
airtight stoves, it is necessary that this con-
nection be sealed in order not to compromise
the overall sealing characteristic of the sys-
tem.
4.4 - SMOKE EXHAUST
The heat generator works under negative pressure and is
equipped with an outlet fan for smoke exhaust. The exhaust
system must be unique for the generator, no exhausts in a
chimney shared with other devices are permitted.
The components of the flue gas exhaust system must be cho
-
sen in relation to the type of appliance to be installed according
to:
-
UNI 11278 in the case of metal chimneys, with special
reference to that indicated in the designation;
-
UNI EN 13063-1 and UNI EN 13063-2, UNI EN 1457, - UNI
EN 1806: in the case of non-metallic chimneys.
-
It is necessary to provide a 'T' connection with a condensate
collection cap at the base of each vertical section.
-
If the exhaust does not fit into an existing chimney, a vertical
section with a windproof terminal (UNI 10683) is required.
-
The vertical pipe can be inside or outside the building. If the
smoke duct fits into an existing chimney, it must be certified
for solid fuels.
-
If the smoke duct is outside the building or passes through
cold areas (attic), it must always be insulated.
-
The smoke ducts must be equipped with at least one sealed
outlet for possible smoke sampling.
-
All sections of the flue gas pipe must be able to be inspected.
-
Inspection openings for cleaning must be provided.
-
If the generator has a flue gas temperature of less than
160°C+ room temperature due to high efficiency (see
technical data), it must be absolutely resistant to moisture.
-
A chimney system that does not comply with the above
points or, in general, that is not up to standard, can be the
cause of condensation phenomena within it.
-
The direct wall discharge of combustion products to en-
closed or open spaces is prohibited
.
4.5 - CHIMNEY
4.5.1 - TECHNICAL FEATURES
Build or, if already existing, have the efficiency of the chimney
checked by a qualified technician.
The chimney must be smoke-tight, have a vertical course with-
out bottlenecks, be made of materials that are impermeable to
smoke, condensation, thermally insulated and suitable to with-
stand normal mechanical stress over time (A/316 or insulated
double-chamber refractory chimneys with a round cross-sec-
ROOF AT 15°
A
MIN 1.00 metres
B
DISTANCE > 1.85 metres
C
DISTANCE < 1.85 metres
D
0.5 metres ABOVE THE
ROOF RIDGE
E
0.50 metres
F
REFLUX ZONE
tion are recommended). It must be insulated externally to avoid
condensation and reduce the effect of flue gas cooling. It must
be spaced from combustible or easily flammable materials with
an air gap or insulating materials: check the distance speci-
fied by the chimney manufacturer according to EN1443. The
chimney inlet must be in the same room as the appliance or, at
most, in the adjoining room and have a soot and condensate
collection chamber underneath the inlet, accessible through an
airtight metal door.
Summary of Contents for NUA
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