David Bolton Where to Mount a REX Sensor So It Actually Works: Height, Angle, and Coverage Decisions at the Door The Sensor Is Installed. The Door Still Does Not Release. Sound Familiar? Request-to-exit (REX) sensors are a small but critical component of every electrified door opening. Mount one two inches too h... PIR-sensor access-control door-hardware-installation electrified-hardware request-to-exit Oct 5, 2026