The Von Duprin Chexit is a delayed egress option available on all 98/99, 98/99AP, and 33A/35A series exit devices. Used for its ability to address security and safety concerns, applications include behavioral health and memory care facilities, airports and retail environments. The standard device sounds an alarm and keeps the door secured for 15 sec. following an exit attempt with immediate release upon fire alarm. Numerous configurable settings allow customization.