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The calculation of minute ventilation is simple: MV=TV*Rf or minute volume is equal to tidal volume (amount of air for one breath, ml) multiplied by the respiratory frequency (number of breaths per minute). This table shows normal minute ventilation (liters of air per minute) in healthy subjects at rest (14 studies).
How much airflow do we need to ventilate? Area Method. Derives the ventilation rate from the area of the space (in square feet) to be ventilated multiplied by the ventilation rate per square foot. Example: For residential bathrooms up to 100 sq. ft. in area, HVI recommends an exhaust rate of 1 cfm per square foot. A bathroom is 6â² to 10â² or 60 square feet.