How often must inaccessible fire alarm devices be tested?

Inaccessible fire alarm devices must be tested every 18 months to ensure that they remain functional and compliant with safety regulations. This testing frequency is established by codes and standards that govern fire safety systems, including those set by organizations like the National Fire Protection Association (NFPA). Regular testing of inaccessible devices is crucial, as it helps identify any issues or faults that could prevent them from working effectively in an emergency situation. Ensuring these devices are tested on this timeline helps maintain the overall reliability and effectiveness of the fire alarm system, contributing to the safety of occupants in a building.