53
| eNgLIsh
VeNTILATION AND AerATION OF The INsTALLATION PreMIses
Ventilation is deemed sufficient when the room is equipped with air inlets according to the table:
Air inlet
See figure 2
appliance categories
reference standard
Percentage of the
net opening section with
respect to the appliance fumes
outlet section
minimum net opening value of
the ventilation duct
Boilers
UNI EN 303-5
50%
100 cm²
In any case ventilation is deemed sufficient when the pressure difference between the external and internal environment is
equal to or less than 4 Pa.
In the presence of type B gas appliances with intermittent operation not intended for heating, they must have their own aeration
and/or ventilation opening. The air inlets must meet the following requirements:
they must be protected with grids, metal mesh, etc., but without reducing the net useful section;
they must be made so as to make the maintenance operations possible;
positioned so that they cannot be obstructed;
The air flow can also be obtained from a room adjacent to that of installation (indirect aeration and ventilation), as long as the
flow takes place freely through permanent openings communicating with the outside.
The adjacent room cannot be used as a garage, warehouse of combustible material or for any other activity with a fire hazard,
bathroom, bedroom or common room of the building.
FuMes exhAusT sysTeM
geNerAL requIreMeNTs
Each appliance must be connected to a suitable fumes exhaust system and ensure adequate dispersion of the combustion
products into the atmosphere. The combustion products must discharged above the roof. Direct discharge from the wall or
towards closed spaces is forbidden, even with clear skies.
In particular, it is forbidden to use flexible and extendible metal pipes.
The chimney should only receive the exhaust of the smoke duct connected to the appliance; collective flues or conveying
exhausts from hoods above cooking appliances of any kind, or exhausts from other generators into the chimney itself or smoke
duct are not allowed.
The smoke duct and the chimney must be connected with a continuity solution, in order to prevent the chimney from resting
on the appliance.
It is forbidden to have other air supply channels and pipes for plant engineering transit inside the fumes exhaust systems,
especially if over-sized.
The components of the fumes exhaust system must be chosen in relation to the type
of appliance to be installed in compliance with:
in the event of metal chimneys, UNI/ TS 11278, with particular attention to what is stated in the specification;
in the event of non-metallic chimneys: UNI EN 13063-1 and UNI EN 13063-2, UNI EN 1457, .-UNI EN 1806; considering
especially:
temperature class;
pressure class (fumes seal) at least equal to the seal required for the appliance;
moisture resistance (resistance to condensation);
class or level of corrosion and specification of the materials constituting the inner wall in contact with the fumes.
soot fire resistance class;
minimum distance from combustible materials
The installer of the fumes exhaust system, once the installation is complete and the relevant checks and inspections have been
made, must fix the chimney plaque supplied by the manufacturer with the product in a visible manner, near the fireplace, and
which must be completed with the following information:
