It’s Full Steam Ahead for Delayed Egress Systems

All Hands on Deck



Exact code requirements for delayed exit vary somewhat in different jurisdictions. The iMXD and iEXD are designed to be adaptable to a variety of these codes. Besides building codes, delayed egress systems may be UL listed. The iMXD is UL Listed under the FWAX category for its NFPA 101 operation, and not other modes.

Ideal for HIGHLY Controlled Areas

Building Codes are changing constantly. It is up to you to determine the exact requirements of the AHJ and select the appropriate delayed egress system and settings.


Chexit from Von Duprin is designed for delayed exit applications. The Chexit system is ideal for controlled areas. This concept in delayed exit systems combines life safety with the needs of security and meets all requirements of NFPA 101 for “Special Locking Arrangement.” The Chexit system will keep an exit door secured for a 15 second period, yet tied into the fire alarm system will release immediately when an alarm condition exists. All controls, auxiliary locking, local alarm, and remote signaling output are self-contained in the Chexit assembly, providing safe, secure and easy to install door control hardware.


The Chexit system is ideal for highly controlled areas such as airports, hospitals, government facilities and development labs, retail stores, libraries and security facilities. The CX98 and CX99 are available for rim, mortise lock and surface and concealed vertical rod mounting styles. The CX33A and CX35A are available in rim-mounting style only. Chexit is UL listed for use on panic or fire exit doors 3’ or 4’ wide.


The Chexit device includes decal to apply on the door: PUSH UNTIL ALARM SOUNDS. DOOR CAN BE OPENED IN 15 SECONDS. In addition to the Chexit Bar, a typical complete Chexit system requires a PS873 power supply and a power transfer. They provide power and signal connections from the fixed door frame to the door and the Chexit unit. Chexit features include: non handed; field sizable; 3/4” (19mm) throw, latch bolt and deadlocking.


A Request to Exit Switch is built in to detect when someone attempts to exit. Applying less than 15 pounds to the push pad will cause this switch to start an irreversible alarm cycle.


When the Nuisance Audible and Nuisance Delay options are set to off, the device will go into alarm as soon as the push pad is touched. Turning the Nuisance Delay on will require the push pad to be pressed for 2 seconds before the Chexit goes into alarm, which is ideal in public areas. If the Nuisance Audible and Nuisance Delay are both on, the alarm will sound as soon as the push pad is pressed, but the alarm sequence will stop unless held for 2 seconds or more.


A set of relay contacts (rated 1 ampere, 24VDC) are provided to give external alarm indication. These contacts close when the device is in an irreversible alarm condition. These contacts can be used to drive a horn, lamp, or other signaling devices.
The Key Switch provides the means to arm, disarm, or reset the Chexit. The key can be removed in either the arm or disarm position.


An Indicator Lamp determines the status of the Chexit. When the lamp is off, it indicates “disarmed” and is functioning as a normal exit device. A slow flashing lamp indicates “armed.” A fast flashing indicator lamp indicates the device is in alarm.
Whenever the device is in alarm or the push pad is pressed, the Internal Horn will sound. The volume level of this horn exceeds 85 db at 6 feet. An external door position switch can be connected to the Chexit. The door position switch will cause the alarm to sound if the door is not closed when the device is armed.


The External Inhibit Input (optional) allows remote override of the Chexit in the armed condition. It also allows remote reset of the Chexit in an alarmed condition. The Fire Alarm Input disables the Chexit immediately upon a fire alarm.
An Internal Auxiliary lock is engaged when the Chexit is armed. The locking mechanism is specifically designed to hold securely even when the exit device is struck with forceful blows.


The Rearm Time is the amount of time after the device is activated (via key switch or external inhibit) before it arms. It is designed to give someone time to pass through the door before rearming occurs. The user can change timing for any time between 2 and 28 seconds in two-second intervals. There is also an infinite rearm setting that requires the use of an external door position switch. In this setting the door remains in the rearm mode until the door is closed. This can be useful on jet way doors in an airport.