Air filtration in a furnace___________________?
Correct answer: A. Reduces its thermal efficiency
- A. Reduces its thermal efficiency
- B. Is indicated by flame sting out
- C. Increases the flue gas temperature
- D. None of these
Explanation
Interpreting “air filtration” as unintended air infiltration or leakage, it introduces cold excess air into the furnace and carries heat out with the flue gas, reducing thermal efficiency. The wording likely intends “air infiltration,” but option A matches that standard principle.
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