A REX button shall be located within how many feet of a secured door?

The correct answer is 5 feet. In electronic access control systems, the REX (Request to Exit) button is designed to allow individuals to exit a secured area without needing to use a key or code. Placing the REX button within 5 feet of the secured door ensures that it is easily accessible for users exiting the space, providing a balance between convenience and security.

This distance helps ensure compliance with safety regulations, as it allows for quick egress in emergency situations. Locating the button closer than 5 feet may result in accidental activations or could complicate the physical layout of the access control system. Similarly, positioning it at a greater distance might hinder emergency exit functionality, making it less effective in real-time scenarios. In conclusion, the 5-foot guideline strikes an ideal compromise between usability and security.