Residential HVAC Installation Practice Exam

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Which factor has a direct impact on the cfm calculation in an HVAC system?

  1. Total number of rooms in the house

  2. Size of the HVAC unit

  3. Temperature setting on the thermostat

  4. Volume of the house and air changes per hour

The correct answer is: Volume of the house and air changes per hour

The correct answer is the volume of the house and air changes per hour. This factor directly impacts the calculation of cubic feet per minute (cfm) in an HVAC system because it determines how much air needs to be circulated to properly heat or cool the space. The volume of the house and the desired air changes per hour help determine the necessary airflow to maintain comfort and indoor air quality. Options A, B, and C do not have a direct impact on the cfm calculation in an HVAC system. The total number of rooms in the house, the size of the HVAC unit, and the temperature setting on the thermostat are important factors in HVAC system design and operation but do not affect the cfm calculation directly.

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