Please keep this user manual for future use. It
will expire upon publication of a revised issue
however, so please check when using this manual
if you have the latest available version.
You can check with your distributor, dealer,
AF-X Systems BV or on the website:
www.af-x.com
User Manual AF-X Fireblocker Nano Series version 3.5
10
5.6
Calculation of quantity and type
When you have the protected volume at hand you can use the AF-X Fireblocker Density Calculation Sheet to
determine the amount of extinguishant you need and which types of extinguishing generators to choose. This
Calculation Sheet is available for trained technicians upon request with AF-X Systems at all times.
The capacity of the generators below is already implemented in the calculation sheet
Coverage Model and Temperature Curve
n-CS
n-CM
n-BM
n-BL
Minimum installation height (horizontally)
in cm
Area coverage based on density
30
30
100
100
Maximum installation height in cm
Area coverage based on density
150
150
500
800
Outflow length in cm
150
150
500
600
Outflow length max. temperature 75°C in cm
< 100
< 150
150
200
Outflow length max. temperature 200°C in cm
Does not
occur
Does not
occur
< 50
150
Outflow length max. temperature 400°C in cm
Does not
occur
Does not
occur
Does not
occur
< 100
Design density
calculation
Manual calculation of the design density can be done using the following formula used in EN15276-2 and NFPA
2010:2015
The effective mass of aerosol in the system shall be at least sufficient for the largest single hazard or group of
hazards that are to be protected against simultaneously.
The mass of extinguishant required to achieve the design application density shall be calculated from Formula:
M =
ρ
×
V
where
m
is the total flooding quantity, in g;
ρ
is design application density, in g/m3 (may need to be adjusted to compensate for any special conditions that
would adversely affect the extinguishing efficiency, consult AF-X Systems);
V
is protected volume, in m3 (may include adjacent connected hazards or work areas).
The design density is the extinguishing density multiplied by the mandatory safety factor of 1.3
In addition to these calculated total flooding quantities, additional quantities of extinguishant can be required by
standards to compensate for any special conditions that would adversely affect the extinguishing efficiency or, if
required, by the physical characteristics of the extinguishant.
Consult AF-X Systems in case of special environmental
conditions or applications.
AF-X Fireblocker generator size and quantity selection
In case of the need of more than one aerosol generator to protect a volume, preferably generators of the same
family should be used. In all cases the design shall be realized according to the determined coverage tests of the
AF-X Fireblocker generator(s) involved.
NOTE: As each condensed aerosol generator contains a distinct amount of the solid aerosol-forming compound,
there can be a few options in regard to the unit size and number of the aerosol generators that would be
adequate to achieve the required design quantity.
