AIR CHANGE RATE EQUATIONS
The most generic method used to calculate ventilation air requirements is based on complete changes of air in a structure or room in a given time period. To determine the airflow required to adequately ventilate an area, calculate the Room Volume to be ventilated Width x Length x Height = ft3 (cubic feet) and than calculate the Air Volume requirement by multiplying the Room Volume by the Air Change Rate per hour.
ACH = Cu-ft / min x 60 min/hr / room volume
CFM = ACH x room volume / 60 min/hr
Where
• ACH = Air Change Rate per Hour
• CFM = Air Flow Rate (Cubic Feet per Minute)
• Room volume = Space Volume (Cubic Feet)
The most generic method used to calculate ventilation air requirements is based on complete changes of air in a structure or room in a given time period. To determine the airflow required to adequately ventilate an area, calculate the Room Volume to be ventilated Width x Length x Height = ft3 (cubic feet) and than calculate the Air Volume requirement by multiplying the Room Volume by the Air Change Rate per hour.
ACH = Cu-ft / min x 60 min/hr / room volume
CFM = ACH x room volume / 60 min/hr
Where
• ACH = Air Change Rate per Hour
• CFM = Air Flow Rate (Cubic Feet per Minute)
• Room volume = Space Volume (Cubic Feet)
