What are the safe oxygen levels for entering a vault?

Safe oxygen levels for entering a vault typically fall within the range of 19% to 23%. This range is considered optimal because it supports human life effectively while reducing the risk of fire associated with higher oxygen levels. Air at 21% oxygen is the standard level in the atmosphere that is safe for breathing. Levels above this can pose risks, such as increased flammability of materials, making it essential to monitor and maintain oxygen levels within the specified range to ensure both safety and health.

Entering a vault or confined space with oxygen levels outside this range could lead to hazardous conditions. While levels lower than 19% can cause suffocation or impair cognitive function, levels exceeding 23% can significantly raise fire risks. Therefore, the specified range is critical for safety protocols in these environments.