This measurement represents the resistance to airflow within an air conditioning system’s ductwork. It is the pressure exerted against the duct walls when air is not in motion. A typical example involves measuring the pressure both before and after an air filter; a significant difference indicates a pressure drop, potentially due to a clogged filter.
Maintaining appropriate levels is crucial for system efficiency and longevity. When levels are too high, the HVAC unit works harder to deliver conditioned air, leading to increased energy consumption, reduced cooling capacity, and potential damage to components such as the blower motor. Historically, inefficient systems and duct designs often contributed to elevated levels, highlighting the importance of proper system design and maintenance.
