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

The correct answer is one outlet valve present on a field protective mask. This valve plays a crucial role in ensuring the effectiveness and comfort of the mask. The primary function of the outlet valve is to allow exhaled air to escape from the mask while preventing the entry of contaminants from the environment. This design helps maintain a safe and breathable atmosphere inside the mask, reducing the buildup of humidity and carbon dioxide during prolonged use.

While the mask may have several other components and mechanisms, the single outlet valve is specifically designed to facilitate proper airflow and enhance the wearer's comfort. Understanding the function of this outlet valve is essential for anyone involved in using or training with the field protective mask, as it directly impacts safety and operational effectiveness during missions or in conditions requiring respiratory protection.