Detex EAX-2500FK GRAY/BLACK, Wall Mount, Kit - Flush Mount AC/DC Powered Alarm, EA-561 Warning Sign, Flush Magnetic Switch Contacts and 24VAC Transformer Included

The Detex EAX-2500FK is a complete flush mount alarm kit for hardwired AC/DC applications on emergency exit and restricted access doors. The kit ships with everything needed for a full installation: the EAX-2500 alarm unit, EA-561 warning sign, flush back box, flush magnetic switch contacts, and a 24VAC transformer. The alarm delivers approximately 100dB from a piezo horn when an unauthorized exit is attempted, and the flush design mounts into a standard 4" x 4" double switch or outlet box. Available in gray (standard) or black to match the surrounding wall and door hardware.

What the EAX-2500FK kit includes and why it matters for installation

Door alarm installations often stall when components don't ship together. The EAX-2500FK eliminates that problem by packaging every major component in one order. The flush magnetic switch contacts are the door position sensor that tells the alarm whether the door is open or closed. The 24VAC transformer converts standard 120VAC line voltage to the low-voltage AC input the alarm requires. The warning sign posts the required notice at the door. The back box provides the recessed mounting cavity for the alarm unit in the wall surface next to the door. Ordering these components separately risks mismatches in compatibility or delayed installation when a single item is backordered. The FK suffix specifically designates the flush mount kit configuration, as distinct from the SK1 surface mount kit variant.

Power, field-selectable features, and relay output

The EAX-2500 operates on AC/DC hardwired power as its primary source. An optional 9VDC battery backup maintains alarm function during power outages, and a field-selectable low battery alert notifies building staff when the backup needs replacement. Silent arming is also field selectable, allowing the alarm to be armed without an audible confirmation tone in environments where that signal would be disruptive. The extended bypass feature lets the alarm remain silenced when the door is held open for legitimate traffic and automatically rearms when the door closes, reducing nuisance alerts during receiving, loading, or staged access periods. A relay output is included for connecting external accessories such as building automation systems, remote annunciators, or access control panels that need a door status signal.

Cylinder control and key operation on the EAX-2500FK

The inside key control on the EAX-2500FK uses a mortise cylinder with a standard Yale cam. The patented cam assembly automatically adjusts to fit different cylinder sizes without requiring spacers, which simplifies cylinder replacement and maintenance over the life of the unit. The alarm unit itself ships without a cylinder installed. A factory-installed cylinder can be specified at ordering by adding the xMC65 or xIC7 suffix to the model number. The Key Stop (KS) option configures the lock so the key can only be removed when the alarm is in the armed state, preventing staff from bypassing the alarm by leaving the key inserted. Tamper-resistant housing and cover protect the internal electronics from unauthorized access or vandalism.

The EAX-2500FK carries a 3-year limited manufacturer warranty. For the full range of Detex and other exit alarm products available on this site, browse the exit alarms category. The broader exit hardware section covers coordinating panic devices, door closers, and exit trim for complete door opening specifications. For hardwired access control and electronic security hardware that integrates with alarm systems, the electronic hardware section covers compatible products.

Select gray or black finish and specify the cylinder suffix when ordering if a factory-installed cylinder is required. Confirm the door preparation accommodates a standard 4" x 4" flush back box before installation.