Answers to questions about smoke door labels, closers, latches, and gasketing AND...in a labor of love, I have updated the references in the article to include the 2018 IBC. You're welcome. :D
I receive so many questions about fire doors vs. smoke doors; my article from the June issue of Construction Specifier answer many of them.
I just saw these doors in a hotel, so it seems like a good time to write about the requirements for doors at an elevator hoistway.