Which of the following hazards can cause a sudden drop in box pressure?
A. Bypassing safety interlocks
B. Poor control of excess air and poor draft control
C. Failure to follow flame safety procedure
D. Opening furnace inspection ports when the firebox pressure is greater than atmospheric pressure
A. Incorrect. Bypassing safety interlocks does not cause a sudden drop in box pressure.
B. Incorrect. Poor control of excess air and poor draft control do not cause a sudden drop in box pressure.
C. Incorrect. Failure to follow flame safety procedure does not cause a sudden drop in box pressure.
D. Correct. Opening furnace inspection ports when the firebox pressure is greater than atmospheric pressure can cause a sudden drop in box pressure.
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