Teledata OPEN HOLD ELECTROMAGNET Holding ForceFDM9412E

FDM9412E electromagnetic door holder maintains fire doors in the open position and releases them when an alarm occurs. The moment the fire system cuts power, the magnet releases, the door closes, and the path for smoke and flame propagation is blocked. This product is the component that ensures compartmentation works in practice, not just on paper; it helps keep escape routes usable without smoke infiltration.