Executive orders - Tom Clancy [377]
Along the way he'd noted the air conditioning. It would have been better to set his canister in the system itself, but he'd been briefed on that, too. The Legionnaire's disease outbreak years before in Philadelphia had taught Americans about the need for keeping such systems clean; they often used chlorine to treat the condensate water which humidified the recirculating air, and chlorine would kill the virus as surely as a bullet killed a man. Looking up from the color-printed brochure, he noted the huge circular vents. Cool air descended from them, and washed invisibly along the floor. On being heated by the bodies in the room, the warm air would rise back into the returns and go through the system for cooling-and some degree of disinfection. So he had to pick a spot where the air flow would be his ally, not his enemy, and he considered that, standing there like an interested car shopper. He started wandering more, walking under some of the vents, feeling the gentle, cooling breeze with his skin, evaluating one and another and looking for a good spot to leave his canister. The latter was equally important. The spray period would last for about fifteen seconds. There would be a hissing sound-probably lost in the noise of the crowded building-and a brief fog. The cloud would turn invisible in just a few more seconds; the particulate matter was so small and, being as dense as the surrounding air, would become part of the ambient atmosphere and spread around randomly for at least thirty minutes, perhaps more, depending on the efficiency of the environmental systems in the center. He wanted to expose as many people as possible, consistent with those parameters, and with that renewed thought in his mind, he started wandering again.
It helped that, vast as the auto show was, it did not fill the Javits Center. Every exhibit was constructed of prefabricated parts like those in a business office, and behind many of those were large swatches of cloth, like vertical banners, whose only purpose was to break up the line of sight to empty portions of the building. They were easily accessible, the traveler saw. Nothing was fenced off. You simply ducked around an exhibit. He saw some people holding mini-meetings there, and some circulating maintenance personnel, but little else. The maintenance personnel were a potential problem, though. It wouldn't do to have his canister picked up before it discharged. But such people would be on regular routines, wouldn't they? It was just a matter of discerning the patterns of their movement. Of course. So, he thought, where is the best spot? The show would be open for several more hours. He wanted to pick a perfect place and time, but he'd been briefed not to worry too greatly about that. He took that advice to heart. Better to be covert. That was his primary mission.
The main entrance is there. People entered and left through the same side of the building. Emergency exits were everywhere, all of them properly marked, but with alarm buzzers on them. At the entrance was a bank of air-conditioning vents to form a thermal barrier of sorts, and the returns were mainly in the center of the exhibit hall. So the air flow was designed to move inward from the periphery and everyone had to come