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Net stack temperature is the flue gas temperature:

  1. Downstream of the draft hood

  2. Upstream of the draft hood

  3. Plus the ambient temperature

  4. Minus the ambient temperature

The correct answer is: Minus the ambient temperature

Net stack temperature refers to the measurement of the flue gas temperature after accounting for the influence of ambient conditions. In this context, the flue gas temperature measurement is adjusted to provide a clearer representation of the heat loss and efficiency of the system. By subtracting the ambient temperature from the recorded flue gas temperature, you can ascertain the effective heat being lost through the stack. This calculation helps assess performance and efficiency, and is crucial for evaluating the operation of heating appliances within the gas fitting industry. Understanding net stack temperature is vital for ensuring that heating systems operate efficiently, as it provides insights into how effectively a system is utilizing fuel and how much heat is being vented unnecessarily.