What does a decrease in static pressure generally indicate in an air distribution system?

A decrease in static pressure in an air distribution system typically indicates a blockage in the system. When there is a blockage, such as a partially closed damper, an obstructed duct, or any other obstruction that hinders airflow, it disrupts the flow path and causes a drop in static pressure. This situation occurs because the air encountering resistance is unable to move freely, leading to reduced pressure in that area of the system.

A healthy air distribution system generally maintains specific static pressure levels; any significant deviation, like a decrease, points to potential issues such as blockages. This understanding is crucial for maintaining system efficiency and ensuring proper airflow throughout the space being conditioned. Addressing such blockages is essential to restore the desired airflow and system performance.