Von Duprin 3347A: for all types of single and double doors, UL listed for Panic Exit Hardware. Devices are ANSI A156.3 – 2001 Grade 1. The 3347A is a non-handed exit device that fits door stiles as narrow as 1 ¾” (44mm). of wood door stiles as narrow as 4” (102mm) The newly designed device has a one piece center case cover.