Which of the following improper operation can lead to an explosion in the firebox?
A) Loss of fuel gas or oil
B) Failing to purge firebox
C) Opening pressured header drains and vents
D) Poor control of excess air and draft control
Answer: B
Explanation: A) Incorrect. Failing to purge firebox can lead to an explosion in the firebox.
B) Correct. Failing to purge firebox can lead to an explosion in the firebox.
C) Incorrect. Failing to purge firebox can lead to an explosion in the firebox.
D) Incorrect. Failing to purge firebox can lead to an explosion in the firebox.
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