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Which of the following is NOT a possible indication of exhaust spillage from a gas furnace?
  1. Condensation
  2. Corrosion
  3. Cold air in the draft hood
  4. Hot air in the draft hood
Explanation
Answer: C - Cold air in the draft hood is not a possible indication of exhaust spillage from a gas furnace. When the furnace is operating properly, you expect to feel cold air in the draft hood. However, when there is exhaust spillage, the exhaust air becomes hot and moist.
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