Residential HVAC Installation Practice Exam

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What is the function of flexible duct used at the end of a metal duct run?

  1. A. Increase airflow

  2. B. Enhance energy efficiency

  3. C. Improve insulation

  4. D. Reduce noise

The correct answer is: D. Reduce noise

The correct answer is reducing noise (option D). Flexible ducts are often utilized at the end of a metal duct run to help dampen the sound produced by the airflow within the HVAC system. The flexibility of these types of ducts helps absorb and muffle the noise that would otherwise be transmitted through the metal ductwork, providing a quieter indoor environment for the occupants. Options A, B, and C are incorrect because the primary function of using flexible duct at the end of a metal duct run is to reduce noise rather than to increase airflow, enhance energy efficiency, or improve insulation.

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