A properly functioning HVAC system is a key component to building performance. Proper airflows keep buildings safe and comfortable. Unfortunately, many homes and buildings are suffering from poor airflows and do not even know it. There are many problems which can occur due to poor airflow. The imbalances affect building pressures. These pressure differentials can cause numerous problems including condensation in attic spaces and interstitial wall spaces and back drafting of combustion appliances leading to carbon monoxide issues and comfort complaints.