My old high school is not that financially well-off, so I doubt they’ll ever replace the Fire Alarm system until it fails outright. This takes renovations off the table because if they do any significant work on the building, they’ll have to bring the system up to code. This entails plumbing, electrical, gas, and structure updates (asbestos) in addition to completely replacing the fire alarm system. They could probably re-use the same pull stations unless they’re required to go to an addressable system (though they could also use monitor modules to supervise the conventional pull stations in this case). However, they’d have to install new pull stations at exits and stairwells. The amount of signals that the building would require would be unreal as well. This building has maybe 16 Edwards AC fire horns and they are LOUD! Just some quick napkin math tells me to upgrade to a speaker/strobe system (which would probably be the requirement given that it’s a school) they’d require at least 50-ish signals.