Which of the following hazards can cause cooling of the furnace?
a. Poor control of excess air and draft control
b. Bypassing safety interlocks
c. Opening furnace inspection ports when the firebox pressure is greater than the atmospheric pressure
d. Increasing the air into the furnace
a. Incorrect. Poor control of excess air and draft control does not cause cooling of the furnace.
b. Incorrect. Bypassing safety interlocks does not cause cooling of the furnace.
c. Correct. Opening furnace inspection ports when the firebox pressure is greater than the atmospheric pressure can cause cooling of the furnace.
d. Incorrect. Increasing the air into the furnace does not cause cooling of the furnace.
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