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DESIGN CRITERIA
The conditions and the criteria needed to design an aerosol direct-to-surface or total flooding system are based on volume of space to be protected and the nature of the area to be protected. Since the extinguishing agent can be compared to a gaseous body, and since it reacts mainly through chemical effect, we can define the followings as:

Extinguishing Concentration
The minimal quantity of the extinguishing aerosol compound, expressed in grams per cubic meter, needed for putting out a fire under pre-determined testing conditions, excluding all safety factors.

Design Concentration
The quantity of the extinguishing aerosol compound expressed in grams per cubic meter is taken into consideration, the safety factor including all the characteristics of the environment. The safety factor may have a minimum value of 30% and maximum of 100% in relation to the geometrical characteristics and to the degree of ventilation of the sites that need to be protected.

Maximum concentration,
The quantity of the extinguishing aerosol compound applied to a specific project. Usually, it coincides with the Design concentration, although it can be greater in particular cases. The Design Concentration of Aerosol in total flooding system, certified by the test run at TESI Institute, is fixed at:

67gr/m3

In volumes over false ceiling and under false floor, the design concentrations are respectively:

75 and 85gr/m3

These values are applicable with a limit of 7 meters in height. For premises that have heights over 7 meters and up to a maximum of 12 meters, it should be considered the installation of the system at two different height levels. The applicable mathematical formula that should be used is:

M = C x V

M = total mass of the extinguishing aerosol needed for putting out the fire (excluding the cooling mass)
C = Design concentration
V = the geometric volume of the premises (the Volume is calculated to the net value of the fire-proof material volume, such as beams, pillars, light wells or others).

CALCULATION AND DISTRIBUTION OF THE GENERATORS
In order to determine the appropriate number of fire-extinguishing generators to be distributed in the environment, the following formula is used:

N = M / m
N = Number of fire-extinguishers generators
M = Total mass of the extinguishing aerosol compound
M = extinguishing agent mass of the specific fire-extinguishers chosen (see catalogue)
Where if "N" does not match a whole number, it's rounded up in excess