Fortress Interlocks, of Erlanger, Ky., has launched Door Module (DM), a modular access interlock suitable for use on all types of doors. The unit, part of Fortress' new mGard range of modular interlocks, is available with a selection of all stainless steel actuators suitable for both hinged and sliding doors.

The units have tamper-resistant head mechanisms and require minimal maintenance, according to company information. The head features a choice of four-head rotation angles and two actuator-entry points.

DM is available as a single door lock or with up to ten multiple access lock modules. A system using DM can be expanded at any time with the addition of more modules or trimmed down and the surplus modules used elsewhere.