What is static pressure in the context of ductwork?

Static pressure in the context of ductwork refers to the pressure exerted uniformly in all directions by the air within the duct. This pressure is a crucial factor in HVAC systems, as it determines the air's ability to move through the ductwork efficiently. When static pressure is measured, it reflects the resistance to airflow that is present due to factors like duct size, length, and any obstructions or bends in the system.

Understanding static pressure is essential for designing and balancing duct systems because it helps ensure that air distribution is even and effective throughout a building. Additionally, static pressure is an important parameter for maintaining comfort levels and energy efficiency in heating, ventilation, and air conditioning applications. The other choices represent different concepts related to airflow; for example, pressure felt when air is moving pertains to dynamic pressure, while the total pressure encompasses both static and dynamic pressures, and pressure loss due to friction specifically refers to energy loss as air moves through the ducts.