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