What's A Workplace Evacuation System? Fire is a potential hazard in all workplaces but some industries - particularly where there are open flames, flammable equipment, and sparks - are more of a risk than others. But fire isn't the only reason a workplace might need to be evacuated. There could be a gas leak, a security risk, or a structural issue. An evacuation system can be comprised of hardware like smoke sensors, evac triggers, and evac sirens, manual equipment like air horns and megaphones, or sometimes word of mouth. It's critical that whatever system configuration a workplace installs and uses takes into account the type of risk, the level of risk, and the speed with which workers are told what to do in order to take action. Clear communication about the event - and expectations for those on site - is imperative.