What is required when a recessed piece of hardware is to be installed in a fire barrier? This could apply to actuators for automatic operators, magnetic holders for fire doors or smoke doors, credential readers, and probably other things that I haven’t though of yet.
Is a special mounting box required? Are there limitations on the size or material of that box? Or maybe the component has to be surface-mounted on the wall? Where is this stated in the codes or standards?
This is a question from a current project, so please leave a comment in the reply box if you know where to find this information.