If a home has an AirflowP of 75 CFM and an AirflowB of 100 CFM, what is the home's Building Airflow Standard (BAS)?

To determine the Building Airflow Standard (BAS) of a home, you look for the maximum airflow reading from the two measurements provided: the AirflowP (Passive Airflow) and the AirflowB (Building Airflow). In this scenario, the AirflowP is noted at 75 CFM, while the AirflowB is measured at 100 CFM.

The BAS is intended to reflect the highest level of airflow that the building can achieve without creating undue pressure differences, which can impact the performance of the HVAC system. Because the AirflowB represents the effective airflow that the building is designed to handle and is greater than the passive measurement, it is the value that is considered for the Building Airflow Standard.

Therefore, the BAS for this home is correctly identified as 100 CFM. This helps ensure that the building is operating within the desired airflow parameters and is an important part of maintaining indoor air quality and HVAC efficiency.