Exit devices, also known as panic devices or crash bars, are mechanical devices installed on exit doors to allow easy and quick egress during emergencies. They come in various types and functions to meet different safety and operational requirements. Here are some common types of exit device functions:
Rim Exit Device:
A rim exit device is the most common and basic type of exit device. It consists of a horizontal bar or push pad mounted on the interior surface of the door. When the bar or pad is pushed, it retracts the latchbolt, allowing the door to swing open and providing easy egress.
Vertical Rod Exit Device:
Vertical rod exit devices are designed for double doors where one or both doors are equipped with the device. They have vertical rods that extend from the device's mechanism at the top and bottom of the door to engage with the strike or floor-mounted hardware. When the bar or pad is pushed, the rods retract, allowing the doors to swing open simultaneously.
Mortise Exit Device:
Mortise exit devices are installed within the door itself, requiring a mortise lock preparation. They typically have a push pad or bar on the interior surface and a mortise lock with a latchbolt and deadbolt mechanism. When the bar or pad is pushed, the latchbolt and deadbolt retract, enabling the door to open.
Concealed Exit Device:
Concealed exit devices are designed to be hidden within the door or frame, providing a more aesthetically pleasing appearance. They are often used in architectural or high-end applications where the appearance of the exit device is a significant consideration. Concealed exit devices may be rim, vertical rod, or mortise types, but they are designed to be concealed from view when the door is closed.
Electrically Controlled Exit Device:
Electrically controlled exit devices feature an electric latch retraction mechanism that can be controlled remotely, such as through a keycard access system or fire alarm. They allow for centralized control of unlocking or locking the exit devices, providing enhanced security and convenience.
Delayed Egress Exit Device:
Delayed egress exit devices are designed to deter unauthorized exit from certain areas while still complying with safety regulations. They incorporate a delayed egress mechanism that imposes a preset time delay before the exit device can be fully activated. This delay allows for security personnel to respond or verify exit intentions.
Alarm Exit Device:
Alarm exit devices are equipped with an audible alarm that sounds when the device is activated. They provide a visual and audible alert to notify others that the door has been opened. Alarm exit devices are typically used in areas where unauthorized access or exit attempts need to be immediately detected.
Fire-Rated Exit Device:
Fire-rated exit devices are specifically designed and tested to maintain the fire rating of the door assembly. They comply with fire safety regulations and are used in areas where fire protection is essential. Fire-rated exit devices are constructed with fire-resistant materials and mechanisms that can withstand high temperatures and prevent the spread of fire.
When selecting an exit device function, consider factors such as the door type, anticipated traffic volume, safety regulations, fire code requirements, and accessibility needs. Consult with a door hardware specialist or professional installer to determine the appropriate exit device function for your specific application and to ensure compliance with local codes and regulations.