In the Zero Rescue Profile, floor level temperatures can reach about 300F. Humans last until approximately what temperature?

• A. 149F
• B. 100F
• C. 200F
• D. 300F

Answer: (A)

The idea here is how heat exposure limits a person’s time in an extremely hot environment. When floor temperatures can reach around 300F, the body is under intense heat transfer from the surface, and the window for safe exposure becomes very short. The Zero Rescue Profile uses about 149F as the practical survival threshold in that scenario—the temperature the body can tolerate before heat stress and tissue damage become fatal risk, given that extreme heat is involved. That makes it the best match for the question.

The other temperatures don’t line up with that documented limit: 100F would imply a much longer safe exposure, while 200F or 300F would indicate far more severe conditions with even shorter or non-existent survivable time.