1991 ADA Standards for Accessible Design

A4.10.6 Door Protective and Reopening Device.

The required door reopening device would hold the door open for 20 seconds if the doorway remains obstructed. After 20 seconds, the door may begin to close. However, if designed in accordance with ASME A17.1‒1990, the door closing movement could still be stopped if a person or object exerts sufficient force at any point on the door edge.