SC Air Conditioning Practice Questions - South Carolina Air Conditioning Contractor Examination Exam

The most reliable field method to measure total airflow in a straight section of supply duct is:

Reading only the furnace nameplate CFM Measuring return-grille area and assuming 2,000 fpm A single-point velocity reading at the duct wall A pitot-tube or hot-wire traverse in a straight run, averaged per a standard log-Tchebycheff or equal-area pattern

Correct Answer:

A pitot-tube or hot-wire traverse in a straight run, averaged per a standard log-Tchebycheff or equal-area pattern

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