Integrating Fire Curtains with Fire Alarm and Building Management Systems

An automatic fire curtain doesn't operate in isolation — it needs to receive a reliable signal to deploy at the right moment, and in most projects that signal comes from the building's fire detection and alarm system, sometimes coordinated further through a wider building management system (BMS). Getting this integration right is as important to the curtain's real-world reliability as the curtain's own product certification, and it's a coordination point that spans the fire alarm designer, the M&E consultant and the curtain manufacturer or installer.

How the Interface Typically Works

A fire curtain's control system typically accepts a signal from the fire alarm panel — commonly via a dedicated interface or relay output — that triggers deployment, alongside independent local inputs such as a heat-sensitive fusible link or a local smoke/heat detector at the curtain itself, providing a fail-safe deployment path that doesn't depend entirely on the central fire alarm panel functioning correctly. The curtain's control system also typically reports status back to the fire alarm panel or BMS — deployed/retracted position, fault conditions, power status — so that the building's fire safety systems and facilities management have visibility of the curtain's actual state, not just an assumption that it will work when needed.

Why the Gravity Fail-Safe Still Matters Here

Even with a well-integrated fire alarm connection, the gravity fail-safe mechanism covered in our dedicated article remains the essential backstop: if a fire has already damaged the building's electrical supply or fire alarm wiring before the curtain receives its signal, a properly designed automatic curtain will still deploy under its own weight on loss of power, rather than relying entirely on a signal chain that a fire itself might have already disrupted. Integration with the fire alarm system should be treated as adding a faster, earlier-triggered deployment path, not as replacing the curtain's own independent fail-safe deployment capability.

Coordination Points Worth Confirming Early

• —Confirm which specific fire alarm zones or detection devices are intended to trigger each curtain — a coordination detail that needs to sit in both the fire alarm cause-and-effect matrix and the curtain's own control specification.
• —Confirm power supply arrangements and backup provision for the curtain's control system, distinct from the fire alarm system's own backup power.
• —Where a BMS is present, confirm what status information (deployed/retracted, fault) is expected to be visible at the BMS level, and that the curtain's control system can actually provide it in a compatible format.
• —Test the actual interface — not just each system independently — during commissioning, since cause-and-effect logic errors between separately commissioned fire alarm and curtain systems are a realistic and specifically documented risk.
• —Confirm manual override and reset procedures are understood by the building's facilities team, since a curtain that has deployed needs a documented, safe procedure to retract and reset after an event or false alarm.

Who Needs to Be Involved

This integration genuinely needs input from more than one discipline: the fire alarm system designer (for the cause-and-effect logic and interface method), the curtain manufacturer or specialist installer (for the curtain's own control requirements and fail-safe behaviour), and — on larger or more automated buildings — the BMS integrator. Treating fire curtain integration as a task the curtain installer can resolve entirely independently, without input from the fire alarm designer, is a common source of coordination gaps discovered only at commissioning stage.

BÖLDT's automatic fire curtains include a gravity fail-safe mechanism as standard and are supplied with control system documentation to support coordination with a project's fire alarm and BMS design from an early stage.