Add both security and convenience to your workplace, school or other facility with Von Duprin's top of the line exit devices. Exit devices are a critical part of the Fire and Life Safety egress system and will provide safe and reliable service when properly applied and maintained. All 33 series devices include a fluid dampener that decelerates the pushpad on its return stroke and eliminates most noise associated with exit device operations. 33AEO works with all types of single and double doors that include a mullion and features a smooth case.