H07023380 / DT2000477-03
The chimney stack is a device fi tted on the top of the chimney that is designed
to aid dispersion of the products of combustion in the atmosphere.
The chimney stack must comply with the following requirements:
it must have an internal section and shape the same as the fl ue (A);
it must have a useful outlet section (B) of not less than twice that of the
fl ue (A);
the part of the chimney that emerges from the roof or remains in contact
with the outside (e.g. in the case of a fl at roof), must be covered with brick
or tile elements and in any case well insulated;
It must be built in such a way as to prevent the penetration of rain, snow
and foreign matter into the fl ue and to ensure that in the event of winds
from all directions and angle, discharge of the combustion products is
assured (chimney stack with down-draught cowl).
Recommended distances for correct chimney operation.
To ensure trouble-free operation of the chimney and allow correct dilution of
the products of combustion in the air, the chimney stack must be installed
at the distances given below:
6-8 metres from any buildings or other obstacles that are higher than the
chimney stack;
50 centimetres higher than any obstacles located at a distance less than
5 metres;
outside the refl ux area. The size and shape of this area differ according to
the angle of inclination of the roof and it is therefore necessary to adopt the
minimum heights shown below.
Fig. 9
Fig. 8
B equivale al
doppio di A
Fig. 7
α
A
H minimum
H minimum
Z
15°
30°
45°
60°
1,85 m
1,50 m
1,30 m
1,20 m
1,00 m
1,30 m
2,00 m
2,60 m
0,50 m
0,80 m
1,50 m
2,10 m
1.3 CHIMNEY STACK
DT2010025-03
6
DT2030052-00
DT2030191-00
DT2030051-00
English
Example:
Check the slope of the roof (
column
α
), and the anticipated
distance of the chimney stack from the axis of the ridge (
column A
); if the
distance is greater than “
A
” the height of the chimney stack may be read
in (
column H
); if the distance is less than “
A
” the chimney stack must rise
above the ridge by 0.5 metres.
* B it is twice
of to A
Fig. 10
Fig. 11
FLAT ROOF
over 5 m
5 m or less
5 m or less
SLOPING ROOF
distance more than A
ridge axis
distance
min. than A
0.50 m above the ridge
height of refl ux
area z
DT2030053-00
DT2030192-00
Pitch of the floor
Horizontal width of reflux area
from ridge axis
Minimum height of
outlet from root
Height of reflux area
Summary of Contents for MONIA
Page 42: ...H07023380 DT2000477 03 42 ...
Page 43: ...H07023380 DT2000477 03 43 ...
