The choice of lockset to be used is an important one. Typically, rescue hardware is used with a cylindrical lockset (with or without dead latching). With a cylindrical lock and a typical door gap, the strike pocket is large enough to allow the dead latching trigger to fall into the pocket, allowing the latch bolt to be depressed to open the door.
If a mortise lockset is used, it must be a type with no dead latching. If the mortise lock has dead latching, when the dead latching trigger is depressed against the strike when the door is closed, it does not allow the main latch bolt to be depressed. The main latch bolt must be able to be depressed to roll out of the strike pocket in the case of an emergency.
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