For a fire extinguisher to be effective, it must be all of the following EXCEPT:

For a fire extinguisher to be effective, it is essential that it meets certain criteria, which primarily revolve around accessibility, functionality, and suitability for specific types of fires.

The focus on being readily accessible ensures that individuals can quickly reach the extinguisher in the event of a fire emergency, allowing for a prompt response to suppress the fire.

Being in working order is vital since a malfunctioning extinguisher may fail to operate when it is most needed, defeating its purpose entirely. Regular maintenance checks are crucial to ensure that extinguishers are charged and ready for use.

Suitability for the hazard is also critical; different types of extinguishers are designed to combat specific classes of fires (e.g., Class A for ordinary combustibles, Class B for flammable liquids, etc.). Using the right type of extinguisher can mean the difference between successfully controlling a fire and exacerbating the situation.

While it might be beneficial for an extinguisher to be light enough to carry, the weight is not a defining characteristic of its effectiveness. An extinguisher could be relatively heavy but still effective if it meets the other critical criteria. Therefore, the emphasis should be placed on its accessibility, operational status, and compatibility with the fire risk