I’d like to tell you where I got these photos but then I’d have to kill you and that would be bad for business.  😀
They are posted with permission from someone who’s spending A LOT of time looking at fire doors lately.

And yes, these are fire doors:

And in case you’re not sure what you’re looking at here, it’s a view from above showing the section of the door’s top channel that’s missing, and the thru-bolts for the hinge in the void.

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