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2.3.8 Chimney cap
The good draught of the chimney flue also depends on the type of terminal covering the top of the chimney, which must comply
with the following requirements:
Have the same inner section as that of the chimney flue.
Its usable section at the outlet must not be less than the double of the inner section of the chimney flue.
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 flows around the house (the use of wind-stop terminals is recommended).
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 figure below.
In case there are two or more adjacent chimneys, the one which exhausts from a solid fuel appliance or which serves an upper
floor must terminate at least 50 cm above the other/s to avoid draught problems.
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.
FLAT ROOF
SLOPING ROOF
Angle of roof
α
expressed in
degrees (°)
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 downdraft area
Z
expressed in metres (m)
15 1,85 1,00 0,50
30 1,50 1,30 0,80
45 1,30 2,00 1,50
60 1,20 2,60 2,10
ENGLISH
TECH 3
27
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