Garage door lock stuck in locked position?
Are the pipes busting around the fittings and what kinda pipes are they?. Sounds like their is to much water pressure.
This idea seems to have several flaws. First, nobody can be in the air tight room for more then the time it takes to use up the oxygen in the room. Second, the change in air pressure would be pretty small, so you'd either get lots of false trips or it wouldn't trip when you wanted it to. It would be better to use a sensor that used heat rise. Third, what would a person do if they were in the room when a fire broke out? They would die from the lack of oxygen (faster then in the first case). And finally, since this room is of limited space, it will burn off the oxygen in the room during the fire and snuff itself out even if you don't evacuate the remaining air in the room. And if you haven't done anything but take the oxygen out of the room, the fire would likely restart when you vent air back into the room.
