What type of control does a clearly identified break-glass switch provide for ventilation systems?

A break-glass switch is a safety feature typically found in ventilation systems, allowing for emergency control of the system. When activated, it provides an immediate way to halt the operation of the ventilation system in case of an emergency, making it effectively an "off-only control."

This type of switch does not provide an option to turn the system on; its primary function is to quickly disable it to ensure safety. The design of a break-glass switch underscores its intended use in emergency situations, where quick action is necessary to address potential hazards, such as smoke or fire. Hence, its simplicity is paramount, solely focusing on stopping operation rather than toggling or controlling the system in a more nuanced manner.

Understanding this mechanism is vital for ensuring that emergency protocols are followed and that the ventilation systems can be rapidly controlled when necessary.