NFPA 1403 Standard On Live Fire Training Evolutions Instructor-in-Charge (IIC) Practice Test

Which statement best describes hourly sweat loss in hot and humid environments?

2 quarts per hour 0.5 liters per hour 3-4 liters per hour 1-2 liters per hour

Correct Answer:

1-2 liters per hour

Explanation:

In hot, humid conditions with turnout gear, sweat loss during heavy work is substantial but typically falls in a range around 1–2 liters per hour. The gear impedes evaporation, so the body sweats a lot to try to cool, but the rate varies among individuals and situations. Values as low as 0.5 L/hour don’t reflect the effort and gear, while 3–4 L/hour would be extreme and unsustainable for most people. Saying 2 quarts per hour is close to the 1.9 L/hour mark, but the explicit 1–2 liters per hour range best captures the common, practical amount across conditions. This is why 1–2 L/hour is the best description.

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