version 4.7.2 – July 10th, 2022 Firmware version V2.1.7 and higher
EXXFIRE Installation and Service Manual 17
Compatibility
The EXXFIRE CNF systems can be a substitute for the EXXFIRE
®
750/1500/2250. The top mounting
kits are equal for all EXXFIRE aspirating smoke detection systems, where the rack mounting kits for
the EXXFIRE CNF system contains additional brackets as compared to the rack mounting kits for the
EXXFIRE
®
750/1500/2250. As the length of the EXXFIRE CNF systems are different it might be
needed to adjust the length of the gas pipe.
About Cool Gas Generators
The CGG’s supply the nitrogen gas to dilute the oxygen level within the protected space, and
consequently suppress the fire.
The CGG stores the gas as a chemical solid. The gas is bound up in a molecule which naturally
forms a solid at room temperature and is released when a chain reaction is started within the
canister. This controlled decomposition of the solid ‘grain’ reaches high temperatures as it breaks
down, before passing through a cleansing and heat absorbing filter.
Finally, the cooled nitrogen gas is passed through a very fine filter to remove further impurities
before being released into the protected space.
The base material for the gas production is Sodium Azide. This is mixed with a number of other
modifying chemicals to make the grain perform with the desired characteristics. The encapsulated
product is generally safe to handle.
When the CGG is deployed to protect against a fire, the core grain material (Sodium Azide) changes
state as it is decomposed to produce Nitrogen gas, and a Sodium ‘Slack’ is formed. As Sodium can
exhibit energetic reactions in certain conditions, it is imperative that care is taken to follow the basic
installation and handling guidelines.
With appropriate handling, the CGG will remain in a safe and stable configuration throughout its
lifecycle, allowing it to be transported, stored, used, and recycled in line with local legislation. As
with many high-tech chemical products mistreating the CGG could lead to potentially dangerous
exposure of energetic chemicals.
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