BPI Home Energy Professional (HEP) QCI Training Practice Exam 2025 – All-in-One Guide to Mastering Quality Control Inspection!

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How is Airflow(b) or Airflow(p) converted to CFM50?

Airflow x N = CFM50

The conversion from airflow measured in different units to CFM50 involves applying the concept of a correction factor known as the "N factor." This factor accounts for the difference in pressure conditions when measuring airflow compared to the standard 50 pascals used in the CFM50 calculation.

When you multiply the measured airflow (whether it's airflow at another pressure point like Airflow(b) or Airflow(p)) by the N factor, you are effectively normalizing it to the CFM50 standard. The N factor reflects the interface between the actual airflow and the desired standardized measurement, thus yielding a conversion that accurately represents airflow under standardized test conditions.

In summary, using the formula where you multiply airflow by the N factor allows you to achieve a proper conversion to CFM50, ensuring the measurement is consistent with code and performance requirements.

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Airflow / N = CFM50

Airflow + N = CFM50

Airflow - N = CFM50

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