What safety feature must be installed by each door leading out of a new boiler room?

In a boiler room setting, safety features are paramount to ensure the wellbeing of personnel and the safe operation of the equipment. The correct answer involves the installation of a kill switch at each door leading out of a new boiler room. This safety feature allows operators to swiftly shut down the boiler in case of an emergency. The presence of a kill switch provides immediate access to an emergency shutdown mechanism, facilitating a rapid response to potentially hazardous situations.

In contrast, while other options may contribute to safety in their own right, they do not serve the specific function of rapidly shutting down equipment in urgent circumstances. A low water cutoff is crucial for preventing damage to the boiler but is not specifically tied to access points. Emergency exit signs are important for safe evacuation, and warning lights provide visual prompts but do not directly allow for immediate operational control. Thus, the requirement for a kill switch underscores the focus on operational safety, ensuring that personnel can respond effectively to emergencies.