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Trim and Response for Supply Pressure

 by Andrew Walton

Static Air Pressure (SAP)

“Trim and response” is a way of controlling static air pressure (SAP) within a building’s HVAC system. SAP is one of the most important factors in HVAC design. SAP refers to the resistance to airflow in a heating and cooling system’s components and ductwork within a building. The push of the air must be greater than the resistance to the flow or no air will circulate through the ducts.

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