What type of furnace draft uses rotary blowers, driven by electric motors or steam turbines?
A. Assisted draft
B. Induced draft
C. Natural draft
D. Balanced draft
A. Correct. Assisted draft furnaces use rotary blowers, driven by electric motors or steam turbines.
B. Incorrect. Induced draft furnaces use a fan located at the top of the furnace to draw flue gas from the furnace body into the stack.
C. Incorrect. Natural draft furnaces have no mechanical draft or fans.
D. Incorrect. Balanced draft furnaces use two fans to facilitate airflow.
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