How many BTU are generated per cubic foot delivered to the fire?

• A. 537
• B. 600
• C. 500
• D. 550

Answer: (A)

This question tests how we quantify the heat energy actually delivered to the fire per unit volume of gas entering the flame. The delivered heat per cubic foot reflects the energy released by combustion that contributes to heating the surroundings, not just the inherent energy content of the fuel. In standard fire dynamics references, this value is about 537 BTU per cubic foot of gas delivered to the fire. This benchmark helps estimate heat input, assess how ventilation changes affect heat load, and predict fire growth under different ventilation scenarios. Real-world factors like fuel type and incomplete combustion can shift the exact amount, but 537 BTU/ft³ is the commonly used reference in training.