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When an LP unit is properly installed and operating normally, what is the CO2 content of the exhaust gases?

  1. 6% - 7.5%

  2. 10% - 11.8%

  3. 12% - 13.5%

  4. 14% - 15.5%

The correct answer is: 10% - 11.8%

In general, the CO2 content in the exhaust gases of an LP unit that is installed and functioning properly should be around 10% to 11.8%. This is because LP units are designed to efficiently convert fuel into heat, resulting in a lower CO2 content in the exhaust gases compared to other heating options. Options A, C, and D have CO2 content ranges that are either too low or too high, indicating that the LP unit may not be installed or functioning properly. Therefore, B is the most accurate and appropriate answer.