What method has been included in model codes to control doors and address security concerns regarding unauthorized access?

The inclusion of electromagnetically locked egress doors in model codes is significant due to their ability to enhance both security and life safety. These systems employ electromagnets to keep doors securely locked until a specific condition, such as a power failure or the activation of a fire alarm, occurs, allowing for free egress. This is crucial in emergency situations where quick and unobstructed exit from a building is essential for life safety.

The design ensures that while the doors are secure against unauthorized entry, they will automatically unlock under certain emergency conditions, facilitating the safe evacuation of occupants. In contrast, although magnetically locked doors have some similar properties, they may not inherently ensure egress during an emergency without explicit safety measures. Electronic access control systems, while effective for restricting entry, can sometimes complicate rapid egress unless specifically designed for emergencies. Mechanical key systems, although traditional, do not provide the same level of security and convenience in terms of automatic unlocking during emergencies. This makes electromagnetically locked egress doors a favored choice within model codes for balancing access control and safety.