LIGHT series
ENGLISH
2.3.9
$IJNOFZDBQ
The good draught of the chimney
fl
ue also depends on the
type of terminal covering the top of the chimney, which must
comply with the following requirements:
t
have the same inner section as that of the chimney
fl
ue;
t
its usable section at the outlet must not be less than the
double of the inner section of the chimney
fl
ue;
t
be built or designed in such a way as to prevent the entry of
rain, snow, foreign bodies, and to ensure the correct release of
the combustion products even in case of air
fl
ows around the
house (the use of wind-stop terminals is recommended);
t
be located so as to ensure the correct release and diluition of
the products of combustion at a distance away from any area
subject to downdraft, whose size depends on the angle of
the roof; therefore it is necessary to comply with the required
minimum heights in the
fi
gure below;
t
in case there are two or more adjacent chimneys, the one
which exhausts from a solid fuel appliance or which serves an
upper
fl
oor must terminate at least 50 cm above the other/s
to avoid draught problems;
t
the distance from the chimney cap and any higher buildings,
plants, trees, etc. must not be less than 8/10 m. In case the
distance is less than the required, the cap must terminate at
least 1 m above them.
0,50 above the ridge
min.
H
distance
)
A
distance >
A
height of
dawndraft area
Z
_
ridge axle
dawndraft area
0,50 m
technical
volume
d > 5 m
0,50 m
d
)
5 m
FLAT ROOF
SLOPING ROOF
angle of roof
_
expressed in degrees (
°
)
15
30
45
60
1,85
1,50
1,30
1,20
1,00
1,30
2,00
2,60
0,50
0,80
1,50
2,10
clearance from axle
of roof top to chimney
A
expressed in metres (m)
Min. height of outlet
measured from the roof
H
expressed in metres (m)
height of dawndraft area
Z
expressed in metres (m)