The capacity of required portable fluid extinguishers should not exceed more than 13,5 litres but not less than 9 litres. Other extinguishers should be at least as portable as the 13,5 litre fluid extinguishers, and should have a fire-extinguishing capability at least equivalent to a 9 litre fluid extinguisher.
The following capacities may be taken as equivalents:
- 9 litre fluid extinguisher (water or foam).
- 5 kg dry powder.
- 5 kg carbon dioxide.