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NATE Gas Heating Exam, questions with complete top solutions
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NATE Gas Heating Exam, questions with complete top solutions 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% C: 78% Many pre-1992 furnaces have ...
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