New Definitions in 2024 IBC - Automatic Flush Bolt & Constant Latching Bolt

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AUTOMATIC FLUSH BOLT. Door-locking hardware, installed on the inactive leaf of a pair of doors, which has a bolt that is extended automatically into the door frame or floor when the active leaf is closed after the inactive leaf, and which holds the inactive leaf in a closed position. When the active leaf is opened, the automatic flush bolt retracts the bolt or rod, allowing the inactive leaf to be opened (see "Constant latching bolt," "Dead bolt," "Manual bolt").

CONSTANT LATCHING BOLT. Door-locking hardware installed on the inactive leaf of a pair of doors consisting of a bolt that automatically latches into the door frame or floor, holding the inactive leaf in a closed position. The latch bolt is retracted manually to allow the inactive leaf to be opened.