Residential HVAC Installation Practice Exam

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Which formula is used to calculate the cfm (infiltration) in an HVAC system?

(ACH × HOUSE VOLUME) ÷ 60
(HOUSE VOLUME ÷ ACH) × 60
(ACH × 60) ÷ HOUSE VOLUME
(HOUSE VOLUME × 60) ÷ ACH

The correct answer is: (ACH × HOUSE VOLUME) ÷ 60

The correct formula used to calculate the cfm (infiltration) in an HVAC system is (ACH × HOUSE VOLUME) ÷ 60. This formula takes into account the Air Changes per Hour (ACH) needed for proper ventilation and the volume of the house to determine the airflow required in cubic feet per minute (cfm). By multiplying the ACH by the house volume and dividing by 60 minutes per hour, you can accurately determine the cfm needed for proper ventilation. The other options provide incorrect formula combinations that do not accurately calculate the cfm for infiltration in an HVAC system.