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A Category I natural gas furnace has a typical air temperature rise of:

  1. 40 F - 70 F

  2. 30 F - 60 F

  3. 20 F - 50 F

  4. 50 F - 80 F

The correct answer is: 40 F - 70 F

A Category I natural gas furnace typically has a air temperature rise of 40 F - 70 F. This temperature rise is indicative of the efficiency of the gas furnace in heating the air that passes through it. It is important for the temperature rise to be within this range to ensure proper heating performance and efficient operation of the furnace. Options B, C, and D are incorrect because they do not fall within the typical range for a Category I natural gas furnace's air temperature rise. A temperature rise below 40 F may indicate an issue with the furnace's heating capacity, while a temperature rise above 70 F may signify inefficient operation or potential overheating concerns. Therefore, option A (40 F - 70 F) is the correct answer for this question.