NATE Gas Heating Practice Exam

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Study for the NATE Gas Heating Exam. Practice with interactive flashcards and multiple-choice questions, each offering hints and explanations. Prepare effectively for your test!

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Mid-efficiency furnaces have flue gas temperatures between which two ranges?

275 and 360 degrees
200 and 500 degrees
100 and 275 degrees
80 and 100 degrees

The correct answer is: 275 and 360 degrees

Mid-efficiency furnaces typically operate with flue gas temperatures in the range of 275 to 360 degrees Fahrenheit. This temperature range is characteristic of mid-efficiency units, which generally have an Annual Fuel Utilization Efficiency (AFUE) rating of between 80% to 85%. The flue gas temperature reflects how effectively these furnaces utilize the energy from the gas being burned; higher efficiency typically results in lower flue gas temperatures. The other ranges provided are not suitable for mid-efficiency furnaces. For example, flue gas temperatures below 275 degrees might indicate a high-efficiency furnace, which can operate at significantly lower temperatures due to their more effective heat exchangers and condensing technology. Conversely, the range above 360 degrees hints at less efficient systems, such as traditional furnaces, where more heat is lost through the flue. Thus, the specified range of 275 to 360 degrees accurately reflects the operational characteristics of mid-efficiency systems in the gas heating context.