General Information
April 2020 1-2 06-237619-001
1-1.2 Unsuitable Risks
Kidde IGS shall not be used to extinguish fires in:
• Chemicals containing their own supply of oxygen and which are capable of rapid oxidation
in the absence of air, such as cellulose nitrate or gunpowder
• Mixtures containing oxidizing materials, such as sodium chlorate or sodium nitrate
• Chemicals capable of undergoing auto thermal decomposition, such as some organic per-
oxides and hydrazine
• Reactive metals, such as sodium, potassium, magnesium, titanium, and zirconium
• Reactive hydrides, or metal amides, some which may react violently with a gaseous extin-
guishant
• Flammable gas fires such as methane
All of the materials listed above could potentially create the risk of an explosion in a fire.
1-1.3 Fire Class Table
Different standards have different fire classifications. The table below outlines the classifica-
tions for fires based on the various standards.
LOAEL (Lowest Observed Adverse Effect Level) is the lowest concentration at which an adverse
toxicological or physiological effect has been observed in humans. For Kidde IGS Agents this
value is 52%, corresponding to a residual Oxygen concentration of 10% (sea level equivalent).
The human exposure limit is 3 minutes for inert gas systems designed to concentrations
between 43% and 52%.
Note: For inert gases the LOAEL is based on asphyxiation, the health concern in this instance
being the lowered oxygen concentration.
NOAEL (No Observed Adverse Effect Level) is the highest concentration at which no adverse
toxicological or physiological effect has been observed in humans. For Kidde IGS agents this
value is 43%, corresponding to a residual Oxygen concentration of 12% (sea level equivalent).
The human exposure limit is 5 minutes for Inert gas systems designed to concentrations below
43%.
1-1.4 Agent Cylinder Quantity
There are no limits to the number of agent cylinders that can be used in a Kidde IGS system.
However, the size of the system is limited by the space available for storage of the Agent
cylinders. Large systems may require more space in comparison to other solutions. There is no
restriction with regard to positioning the cylinders horizontally or vertically. There are limits on
the number of cylinders that can be activated by each release unit.
Table 1-1. Fire Classifications
Description
NFPA
Standard
European
Standard
Asia
Combustible materials (wood, paper, fabric, refuse) Class A Class A Class A
Flammable liquids or liquifiable solids Class B Class B Class B
Flammable gas Class B Class C Class C
Flammable metals Class D Class D Class D
Electrical fire Class C not classified
(formerly Class E)
Class E
Cooking oils and fats Class K Class F Class F
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