I used to do work for EDC (Ross Perot owned them at one time I think) anytime I had to pull a floor tile, I had to disable the Halon system. One day one of the IT guys pulled a tile right under an office thermostat, and didn't disable the Halon. Heat cut on, the dust started smoking off the heat strips, set off the fire alarm. You should have seen the bunch of IT geeks scrambling to the Halon closet to pop the head off the canister! LOL!