Interlock doors at an airport

Yesterday in one of the many airports I’ve passed through this month, I saw this bank of interlocked doors.  Once you enter through the first door in the interlock (AKA control vestibule), there is a series of doors and gates that you must pass through before continuing on the egress path.  I didn’t test the doors in the airport, but normally when one door of an interlock is open, the other door or doors can not be opened.  As I have mentioned before, interlocks are not currently addressed in the model codes, so each interlock application must be approved by the Authority Having Jurisdiction (AHJ).

Next to the interlocks in the airport there is a pair of doors with delayed egress locks.  I’m assuming that the purpose of the delayed egress doors is to offset the potential barrier to egress that could be caused by the interlocks.  You might be thinking that delayed egress locks would not be allowed in an airport terminal because delayed egress locks are not permitted by the I-Codes for doors serving assembly occupancies (with this exception).  However, it is very common for delayed egress locks to be approved by the AHJ for airports.  During a fire alarm or power failure, the delayed egress locks would typically be required to allow immediate egress with no delay.

What do you think about this application?  Do some AHJs require adjacent delayed egress doors where interlocks are installed?  WWYD?

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