Final answer:
Fire extinguishers are provided for the APU to ensure safety in case of a fire. The number of fire extinguishers depends on the size and layout of the facility.
Step-by-step explanation:
Fire extinguishers are provided for the APU to ensure safety in case of a fire. The exact number of fire extinguishers depends on the size and layout of the facility where the APU is located. Generally, fire safety regulations require that fire extinguishers be easily accessible and strategically placed throughout the building.
For example, a small laboratory may have at least two fire extinguishers, one near the entrance and another near the workstations. On the other hand, a larger building or facility may have multiple fire extinguishers placed at different locations throughout the premises.
It's important to note that fire extinguishers should be regularly inspected, maintained, and replaced as needed to ensure their effectiveness in case of an emergency.