SS EN3-7: 3.3 Clean agent electrically non-conducting, volatile, or gaseous fire extinguishing medium that does not leave a residue upon evaporation. 

There are many types of clean agents used in the industry: 

For total flooding applications (where the agent will completely fill the room to the desired concentration level) the most common use cases are: 

• Data Centers, Server rooms: FM200 (HFC227EA), Novec 1230 (FK-5-1-12) 
• Engine rooms: Carbon Dioxide 
• Mission critical systems such as aircrafts and military installations: Halon 1301

For streaming applications (where an operator is required to manually direct the agent in a fire extinguisher): 

• Carbon Dioxide 
• Halotron I (HCFC-123) 
• FE-36 (HFC236FA)
• Halon 1211 (BCF/Bromochlorodifluoromethane) 

In a contained enclosure, the total flooding clean agent will be discharged and fill the room to the desired concentration level and extinguish the fire easily. 

For streaming applications (fire extinguishers), it is generally more difficult for Clean Agents to contain the fire, simply because they are likely to evaporate before reaching the fire. Which is why a large amount of clean agent is required to put out the same amount of fire. 

Extinguisher Fire Rating comparison by Agent Type

Note: 

- 27A fire rating is twice as effective as a 13A fire rating. 

- 9KG Dry Chemical Powder extinguishers are most commonly found at local gas stations such as Esso, Caltax, Shell, SPC.