In HVAC terminology, what does 'static pressure' refer to?

Static pressure in HVAC terminology specifically refers to the resistance encountered by air as it moves through the ductwork of an HVAC system. It is a critical measurement because it impacts the efficiency and performance of the system. When air flows through ducts, it encounters friction and obstacles, which create this resistance. Static pressure is essential for determining whether the system can move air effectively throughout a space, as higher resistance can lead to issues such as reduced airflow, increased energy consumption, or system failure.

Understanding static pressure helps technicians to design duct systems appropriately, select the right size equipment, and troubleshoot issues within the HVAC system. It's vital for maintaining the desired indoor air quality and comfort while ensuring the system operates efficiently. Other terms such as refrigerant pressure or the pressure exerted by the compressor pertain to different aspects of HVAC systems and do not directly relate to the flow resistance within the ducting.