21
AGUADENS
COSMOGAS
During operation, especially in winter, a plume will be
visible as the water vapour in the exhaust gases come into
contact with the outside air. This plume should not cause
any concern however the installer should discuss the matter
with the customer prior to commencement of the installation
in case the aesthetical impact of this plume might cause a
problem.
5.13.1 - Exhaust flue with indipendent
combustion air grille type B23
In the case of B23 type combustion agent air/fumes exhaust
systems, it is indispensable that the rooms in which the
appliances are installed have at least as much air as that
required by combustion and ventilation of the room. It is
therefore good practice to remember that the combustion of
1 m³ of gas requires 11 cm³ of air. The natural flow of air must
take place directly through permanent openings made in the
outside walls of the room to be ventilated; however away from
sources of pollution, such as: vents of dubious origin, airborne
industrial exhaust etc.
The ventilation openings must meet the following requirements:
have sections with net passage of at least 6 cm² for
every kW of heat input installed, with minimum of 100
cm²;
be realised in a way that the opening inlets both inside
and outside the wall cannot be blocked;
be protected for example with grids, metal meshes, etc.
The net section of the passage must not be reduced by
these elements;
be situated at a height more or less of the floor and such
not to disturb the correct operation of the combustion
products exhaust devices. Where this position is not
possible, the section of the ventilation openings must be
increased by at least 50%.
The flow of air can also be obtained from an adjacent room
as long as:
it has direct ventilation, in compliance with the previous
points;
only this gas appliance is installed in the room to be
ventilated;
the adjacent room is not a bedroom;
the adjacent room is not a common part of the building;
the adjacent room is not an environment with fire hazard,
such as a hangars, garages, combustible materials
warehouse, etc.;
the adjacent room does not have a negative pressure with
respect to the room to be ventilated due to reverse draught
(which can be caused by the presence in the room of
another appliance operating with any type of fuel, a fireplace
and any other intake device for which an adequate air intake
has not been envisioned);
the flow of air from the adjacent room to that to be ventilated
can take place freely through permanent openings with
total net section not less than that indicated at the start of
this chapter.
In rooms where gas appliances are installed, it may become
necessary, as well as the input of combustion agent air, also
to evacuate the stale air, with resulting release of an additional
equal amount of clean air.
If the stale air is evacuated with the aid of a mechanical tool
(electric fan) the following conditions must be respected:
a) If there is a common exhaust pipe in the room, it must be
capped;
b) The ventilation opening of the room in which the gas
appliance is installed must be increased depending on the
maximum air flow rate required at the electric fan.
c) The action of the electric fan must not affect the correct
evacuation of the combustion products. To this end, that
stated above must be verified by draft testing, running the
fan or extractor hood at its maximum power and the gas
appliance at the maximum and minimum power.
5 - INSTALLATION
Flue terminal location
