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5.2.3 Connection to the flue and combustion product exhaust venting
The connection between the appliance and the flue must only receive the discharge from a single
heat generator.
Direct discharge towards enclosed areas, even when roofless, is forbidden.
Direct discharge of combustion products must take place on the roof and the exhaust duct must
have the features set forth in the section
“Chimney or single flue”
.
5.2.4 Chimney cap
The chimney cap must meet the following requirements:
- have an internal section equivalent to that of the chimney;
- have a useful outlet section no less than twice the internal section of the chimney;
- be constructed in such a way as to prevent the penetration of rain, snow and foreign bodies into
the chimney, as well as to assure the discharge of the combustion products also in the presence of
winds coming from any direction and at any angle.
- be positioned in such a way as to assure proper dispersion and dilution of the combustion
products and, in any case, outside the reflux area in which the formation of counter-pressure is
most likely to occur. This area has different sizes and shapes depending on the slope of the roof;
therefore, it is necessary to use the minimum heights indicated in the figures below.
The chimney cap must not have any mechanical suction devices.
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