Tired of pesky pentesters bypassing your locks by triggering the REX sensor on the other side of the door? This won't prevent all of those attacks but it will waste an attacker's precious time by limiting the FOV (Field Of View) of your REX (Request to Exit) sensors without impacting its functionality. Print this tool and attach it with double sided tape to the bottom of the REX sensor to limit compressed air, paper, or other items from being put through the gap between doors (or between a door and the door frame) from triggering the REX sensor. Please reach out if you want a revision made for the REX sensors you use along with the dimensions needed. An additional technique for preventing these types of attacks is to add weather stripping to the gaps around the door.