What does an “earthquake” tab do?
The earthquake tab on the back pan is used in conjunction with a hanger wire (by others) to prevent the diffuser from falling in the event of an earthquake. The hanger wire is anchored above the ceiling plane to a fixed point on the structure. The free end is then passed through the opening in the tab and back around the wire, much the same way a T-bar is hanged. See your local codes to determine actual and adequate methods.
