I agree with Silly on a smoke damper/louver opening on any alarm but if your talking about the setup and relays I think it depends on the equipment.
I may be wrong but as far as relays go I believe most companies are normally closed with the exception of Otis which are wired Normally open. I know at Kone ours have to be wired N.C.
Like I said, I think it really depends on the equipment/controller that is being used.
