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Static Pressure: What It Is, Why It Matters, and How to Read It

Most techs skip static pressure tests—but it’s one of the most important readings you can take. In this video, I break down exactly what static pressure is, why it's the key to diagnosing airflow issues, and how to take accurate readings using a manometer. You'll learn: ✅ How static pressure affects airflow, temperature, motor strain, and more ✅ How to properly place probes based on manufacturer data ✅ How to read blower performance charts to verify airflow ✅ How to choose the right CFM per ton for your region (350, 400, or 450) Whether you're commissioning a system or chasing poor performance, this is the test that reveals the truth. 0:00 Static Pressure: The One Number That Affects Everything 0:45 What Is Static Pressure and Where It Comes From 2:40 How to Measure Total External Static Pressure (TESP) 4:30 Understanding Blower Ratings and Max Pressure 6:18 Interpreting Your Static Pressure Reading 7:22 Using Blower Charts to Find Actual CFM 10:16 Choosing the Right CFM per Ton (350, 400, or 450) 12:18 Real Example: 2-Ton System, Static Pressure, and Target CFM 14:02 How Blower Speed Affects Airflow, Pressure, and the Refrigerant Cycle 15:56 In Heating Mode, It’s All About Temp Rise