SC Boiler Installation Practice Questions - South Carolina Boiler Installation Contractor Examination Exam

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For a multiple-burner boiler, NFPA 85 requires the boiler-enclosure pre-purge to provide not less than which combination of volume changes and airflow?

One volume change at 5 percent of full-load airflow Eight volumetric air changes at not less than 25 percent of full-load mass airflow Thirty volume changes at 100 percent airflow only No purge if the unit has a flame scanner

Correct Answer:

Eight volumetric air changes at not less than 25 percent of full-load mass airflow

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