Fire door won't drop / close on alarm

A fire-rated door fails to close during a fire alarm or drop test. This guide covers fusible links, closing device, guides, and alarm integration.

A fire-rated door that fails to close on alarm or during a drop test is a life-safety failure. Which symptom are you seeing?

This diagnosis assumes the door is a fire-rated assembly with fusible links and/or an alarm-released closing device.

Fire door inspection, testing, and repair must only be performed by a technician with an active fire door certification (e.g., FDAI Certified Fire Door Inspector or equivalent recognized by the AHJ). Uncertified personnel must not service fire door assemblies.
Fire door testing MUST comply with NFPA 80 and local AHJ requirements
Fire doors are life-safety devices. Improper repair or testing can result in a door that fails to close during a fire, putting building occupants at risk of death. Do not take shortcuts.