public double OutsideAirChangesRatePerHour { get; set; }

Public Property OutsideAirChangesRatePerHour As Double
	Get
	Set

public:
property double OutsideAirChangesRatePerHour {
	double get ();
	void set (double value);
}

Air Changes per hour is "unitless". It is a number. It is the number of times the air (the volume) interchanges in the room in one hour. This number is a format for expressing the requirement for airflow. The "flow" requirement for a room might be expressed, e.g., one room of 100 CF, and 3 Air Changes per Hour (ACH), would compute to 100 CF x 3 ACH / 60 min = 5 CFM.