Smoke particles in the air interrupt the beam, triggering alarms and automatic response sequences that vary depending upon the concentration of smoke. This system will be adapted for use in the final display case. By far the most difficult part of the job was selecting the most appropriate suppression system, and then convincing the conservators that it was the best choice. Even if sprinklers were capable of extinguishing a fire quickly enough, the water could cause irreparable damage. Inert agents extinguish fires by displacing oxygen.
Halocarbons are more efficient suppressants, and can be dispensed at lower pressures.
But at high temperatures, they can also produce small quantities of hydrofluoric acid. Though the amounts would be negligible, particularly if the fire were quickly controlled, Rzeznik felt obliged to communicate the possibility to the conservators. Not surprisingly, the possibility of acid contacting irreplaceable fabric was a cause for concern. Rzeznik says there were times he thought concern over the acid might lead the conservators to rely only on the existing sprinkler system, despite his recommendation to the contrary. As is typical for fire protection projects, though, the task that was important enough to require his expertise has only just begun.