Where did you get the information that you "need a delay" on the fire alarm system? Sounds a bit odd to be, TBH.
Also be aware that, in the case of a club, etc, you`ll also need to tie in to the HVAC system, probably the gas supply, and the sound system supplies - they may all have to be isolated in the event of a fire. Contact Regional Fire Officer; they`ll be the ones to tell you exactly what is required, along with Local council - specifically public entertainment licensing division.
HTH
KME