Abstract: A method for measuring outside airflow and return airflow is provided for an air handling system that includes an outside air inlet, a mixed air chamber, a return air inlet, a supply air outlet and a supply fan having a Supply Airflow Station with a fixed area, wherein the mixed air chamber is separated from the outside air inlet via a damper having a plurality of first damper slats. The method includes determining if the Temperature Differential (TD) between the Outside Air and the Return Air is greater than 10° F., where if the TD is greater than 10° F., then determining a position of the first damper slats, and referencing a reference table to identify the percent of outside airflow into the outside air inlet (CFMOA), the actual return airflow (CFMRA) and the total supply air outflow (CFMSA) responsive to the position of the first damper slats.

Abstract: A method for measuring outside airflow and return airflow is provided for an air handling system that includes an outside air inlet, a mixed air chamber, a return air inlet, a supply air outlet and a supply fan having a Supply Airflow Station with a fixed area, wherein the mixed air chamber is separated from the outside air inlet via a damper having a plurality of first damper slats. The method includes determining if the Temperature Differential (TD) between the Outside Air and the Return Air is greater than 10° F., where if the TD is greater than 10° F., then determining a position of the first damper slats, and referencing a reference table to identify the percent of outside airflow into the outside air inlet (CFMOA), the actual return airflow (CFMRA) and the total supply air outflow (CFMSA) responsive to the position of the first damper slats.