How many outlet valves are present on a field protective mask?

A field protective mask is designed to protect the wearer from chemical, biological, radiological, and nuclear (CBRN) agents while allowing for adequate ventilation. The mask typically includes various components that contribute to its functionality and safety.

The correct answer highlights that there is one outlet valve on a field protective mask. This single outlet valve serves an essential function, allowing exhaled air to escape the mask while preventing contaminants from entering. The design of this outlet valve is crucial; it ensures that the wearer can exhale easily without creating a build-up of carbon dioxide or moisture inside the mask, which could impair visibility and comfort.

In contrast, having multiple outlet valves would complicate the mask's design and could potentially introduce points of failure, making it less effective at providing a secure seal against harmful agents. This streamlined approach with one outlet valve is a well-considered feature that emphasizes both efficiency and effectiveness in ensuring the wearer's safety while maintaining operational effectiveness.

Knowing this design aspect is critical in understanding how field protective masks work in real-world scenarios, particularly in CBRN environments.