Superior MICAELA Installation, Use And Maintenance Instructions page 28

1.2 Chimney pot
The smoke stack must be equipped with a device at the top, a chimney pot, which is designed to facilitate the
dispersal into the atmosphere of the by-products of combustion.
The chimney pot must comply with the following requirements:
An internal cross section and shape which conforms to that of the smoke stack;
An available exit area not less than double that of the smoke stack;
The part of the chimney which is above the roof or which remains in contact with the outside air (for example in
the case of open roof gardens), should be clad in brick and at any rate be well insulated. It must be constructed
in such a way to prevent rain, snow or foreign objects from entering the smoke stack, and in such a way as to
ensure that the by-products of combustion are discharged, whatever the wind direction or angle; (wind-proof
chimney pot);
The chimney pot must be located so as to guarantee adequate dispersal and dilution of the products of
combustion and in particular they must be carried away from the area from where these might be drawn back
down the chimney. Such an area varies in size and shape depending on the angle of slope of the roof, so that it
is necessary to apply the minimum heights shown in figures 4 and 5;
The chimney pot must be of the wind-proof kind and exceed the height of the roof ridge, figures 4 and 5;
Any buildings or other obstacles which exceed the height of the chimney pot must not be close to the chimney
itself (fig.4).
Fig. 3
YES
Fig. 5
ROOF ANGLE
α
[°]
15
30
45
60
28
NO
a) flat roof
Distance > A
a) flat roof
HORRIZONTAL WIDTH
OF BACK DRAUGHT AREA CHIMNEY TERMINAL
FROM ROOF AXIS
A
[m]
1,85
1,5
1,3
1,2
Fig. 4
Distance < A
From the ridge
Roof axis
MIN. HEIGHT OF THE
ABOVE THE ROOF
H min = Z+0,50
AREA OF
BACK DRAUGHT
Height of area
of back draught
HEIGHT OF AREA
OF BACK-DRAUGHT
[m]
1
1,3
2
2,6
Z
[m]
0,5
0,8
1,5
2,1