NFPA Portable Fire Extinguishers (NFPA 10) Practice Exam 2026 - Free NFPA 10 Practice Questions and Study Guide

For a fire extinguisher to be considered usable, the pressure gauge should be within the green zone. This zone indicates that the pressure is at an acceptable level for the functionality of the extinguisher. When the gauge is in the green zone, it confirms that the extinguisher is charged and ready for use in the event of a fire. If the pressure falls below this level, it might not operate effectively, and if it is excessively high, it could indicate overcharging, which may pose a risk upon discharge.

Using the pressure gauge correctly is crucial for safety and compliance with fire safety regulations, as fire extinguishers that do not demonstrate proper pressure may not function as intended when needed, potentially leading to hazardous situations. Therefore, ensuring that the pressure gauge remains within the green zone is critical for the reliability and effectiveness of the fire extinguisher.