External Static Pressure Meaning in HVAC: What It Is, How It Works, and Why It Matters
External Static Pressure (ESP) is the total resistance to airflow that an HVAC blower must overcome outside the air handler, created by filters, ducts, coils, grilles, and fittings. It’s measured in inches of water column (in. WC), and most residential systems are designed to run between 0.3 and 0.6 in. WC total. Static pressure, more […]