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NATE Gas Heating Exam Verified Questions And Answers | Latest Update
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NATE Gas Heating Exam Verified Questions And Answers | Latest Update Since 1992, the United States Department of Energy has required that all furnaces sold and installed from that date on must have an AFUE of no less than: A: 70% B: 75% C: 78% D: 80% - ANSWER C: 78% Many pre-1992 furn...
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