The air handlers also helped in removing the halon from the room. As I understand it, during a "normal" (electronically-triggered) Halon dump, the air handlers would have been cut off to maximize the effectiveness of the Halon. In fact, I've heard that Halon's density makes it more dangerous than if it didn't stratify. Unconscious folks, unfortunately, tend to have their noses only an inch or two from the floor... (Did I mention that my office is two floors *below* operations?) These guys (and gals) take their jobs *very* seriously. They aren't going to let anything like the lack of oxygen get in their way! Tim.