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
11
The selected unit sizes should conform to the maximum distance and area coverage and maximum or minimum
protected height limitations as specified for each unit.
For example, in some applications such as cable ducts and trenches several smaller units of the same family
evenly spread along the protected enclosure would provide better distribution and faster achievement of the
minimum design application density throughout the area although one large unit can fulfil the agent quantity
requirement.
Quantity of aerosol generator’s units needed to protect a room can be increased in order not to exceed maximum
coverage distance.
Same unit size formula:
n = M/Mg
where
n
is the rounded up integer number of aerosol generators of one size;
M
is the design quantity, in gram;
Mg
is the mass of the aerosol-forming compound in one generator, in gram.
Different unit sizes:
The height of the protected enclosure should not exceed the maximum height limitation listed for the smallest unit
size selected, unless uniformity of the aerosol distribution for the greater height has been proved by a discharge
test.
5.7
Projection of the generators within the area
The following general criteria should apply:
Ø
for locations, where personnel can be situated, the minimum thermal clearance should refer to the
temperature not exceeding 75 °C;
Ø
for locations, where combustible materials or equipment can be situated, the minimum thermal clearance
should refer to the temperature not exceeding 200 °C;
Ø
for locations, where non-combustible equipment can be situated, the minimum thermal clearance should
refer to the temperature not exceeding 400 °C.
There are a number of rules which are helpful to determine the best positions for the generators in a design.
These rules are based on standards and coverage tests, but each area is different. It is important to adhere to the
standards as much as possible. Needless to say, the distribution of generators in the area should also be in
accordance with local rules and regulations as well as the systems basic design.
a)
Guidelines for the correct positioning and distribution in the area
1.
AF-X Fireblocker Generators need to be positioned in such a way that the discharged aerosol will be
dispersed in the enclosures protected volume as quickly and homogenously as possible.
2.
AF-X Fireblocker Generators are preferably mounted on the wall or at the ceiling, with the discharge
opening pointing downwards at an angle from the ceiling or wall as shown below.
3.
The units need to be evenly distributed in the area.
One larger generator could be more effective than two smaller, the use of two generators could be more
effective than using four, but there are no absolutes. The deciding factor should be whether the chosen
number could fill the area with aerosol rapidly and evenly. After all, every nook and cranny must be filled
with sufficient aerosol.
When in doubt, do not hesitate to contact the AF-X experts.
