What is static pressure in hvac?

Static pressure in HVAC refers to the resistance to airflow in a heating or cooling system. It is measured in units of inches of water column (inWC) and is used to determine the performance and efficiency of an HVAC system.

Static pressure can be classified into two types: external static pressure and internal static pressure. External static pressure is the resistance to airflow in the ductwork, while internal static pressure is the resistance within the equipment, such as filters, coils, and dampers.

Monitoring static pressure is important in maintaining proper airflow and ensuring optimal performance of an HVAC system. High static pressure can indicate that the system is working harder than it should, leading to reduced efficiency and increased energy consumption. On the other hand, low static pressure may result in inadequate airflow and reduced comfort in the building.

To measure static pressure, technicians use a manometer or a digital pressure gauge to take readings at various points in the ductwork and equipment. By adjusting fan speeds, damper positions, and other components, technicians can optimize static pressure levels to ensure proper airflow and efficient operation of the HVAC system.