6
The proper draught conditions in the
flue is critical for the efficient wor-
king of pellet boilers/thermostoves.
All sections of the flue must be ca-
pable of inspection and removable to
enable periodic internal cleaning.
The boiler/hermostove must be con-
nected to a flue pipe or a vertical
duct which can discharge the fumes
at the highest point of the building,
conforming to current national regu-
lations. Failure to comply can lead to
the termination of the guarantee and
of the manufacturer’s responsibility
for the product.
3.5 Flue gasses discharge
To discharge the flue gas outside, make a
hole of an adequate size to the flue pipe.
A T-element with inspection cap and
chimney cowl must be installed on the
flue pipe run.
Maximum two accessible 90° bends are al-
lowed on the flue pipe, each of them must
have a T-fitting with inspection cap. Maxi-
mum permissible flue length is 3 meters
with an upward slope of 3%.
Flue gasses discharge on the wall is
not permitted by current regulations.
Failure to comply can lead to the ter-
mination of the guarantee and of the
manufacturer’s responsibility for the
product.
The first section should not be a
90° bend, as ash would block the
discharge of flue gasses in a short
time, causing draught problems.
Chimney terminal position
For the installation of smoke exhaust
ducts consult the technical regulations UNI
10683. As shown on the fig. 2, the terminal
of the chimney over the roof must have the
following quotes (b>10°):
- a = 500 mm
- c = 1300 mm
fig. 2 - Chimney
In case of the ducts close to each other,
refer to fig. 3 and tab.1.
fig. 3 - Near Chimneys
Symbol
Description (mm)
Clearan-
ce (mm)
Z
Height
B
X ≤ 500
Z + A
B
X ≤ 500
Z + A (*)
A
Height above an obstacle 500
The symbol * means the useful terminal outlet section.
tab. 1
Outdoor Chimney (fig. 4)
Non-condensing insulated chimney system
must be used for external applications. A
chimney tee comprising a cap should be
placed at the bottom of the vertical section
of the chimney.
