ABSTRACT
Airflow patterns are important for proper mixing of supply and room air. Cooled air should be distributed from ceilings or high sidewall outlets. The airflow pattern for cooled air distributed from low sidewall or floor outlets should be adjusted to direct the air up. Automatic temperature control dampers are usually opposed or parallel bladed dampers and can be either two-position or modulating. Two-position control means the damper is either open or closed. If the system is quite simple and the damper is a large part of that resistance, then any movement of the damper will change the resistance of the entire system and good control of the airflow will result. Proper location of balancing dampers not only permits maximum air distribution but also equalizes the pressure drops in the different airflow paths within the system. To control airflow pattern some grilles have a removable louver. Reversing or rotating the louver changes the air direction.
