In both cases I experienced, it was a big giant tank up on the roof of the building. It was separate from the fire suppression system in the server room. I can

In both cases I experienced, it was a big giant tank up on the roof of the building. It was separate from the fire suppression system in the server room. I can see why there would be different systems and code requirements for residential construction. Come to think of it, whilst you could put the tank in an attic space - or use a bladder system, it would occupy a lot of space and I'm not sure residential construction would support the weight of the system.