Fire extinguishers are selected in accordance with the type of fire hazard presented by any given installation. Fire hazards fall into three categories
- Light Hazard
- Ordinary Hazard
- High Hazard
Light Hazard
Where the amount and type of combustibles present are such that initial fires of a small nature only may be expected. Examples of light hazards include.
- Premises such as domestic/residential, offices, school rooms, relocatable buildings, churches and assembly halls that constitute a Class A fire
- Areas where flammable liquids are stored in containers not exceeding 5L in capacity, and the total quantity stored in any one fire compartment does not exceed 25L, which constitutes a Class B fire
Ordinary Hazard
Where the amount and type of combustibles present are such that initial fires of a moderate nature only may be expected. Examples of ordinary hazards include.
- Mercantile storage and display areas, showrooms and workshops which constitute a Class A fire
- Areas where flammable liquids are stored in open top containers in which the exposed surface area of liquid does not exceed 2m sq, or in container storage not exceeding a total of 250l each no greater than 25L which constitutes a Class B fire
High Hazard
Where the amount and type of combustibles present are such that a large initial fire may be expected. Examples of high hazards include.
- Woodworking areas, warehouse with high piled storage in excess of 4.5m, foam plastic storage & processing which constitutes a Class A fire
- Areas where flammable liquids are stored in open top containers in which the exposed surface area of liquid exceeds 2m sq, or in container storage exceeding a total of 250L which constitutes a Class B fire hazard
Note: Fire zones that present additional fire risk such as electrical & gas etc, should be considered when selecting a suitable fire extinguisher