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July 12, 2026
How to Test TESP – Total External Static Pressure on Air Handlers and Gas Furnaces
Most techs know when airflow feels off — but do you actually know how to measure it? In this video, Ty Branaman walks through how to properly test static pressure on a gas furnace and air handler, using real-world scenarios to show you exactly what the numbers mean and why they matter.
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DISCLAIMER: HVAC School is NOT an official OSHA safety training resource! Although we provide safety tips in good faith, our website is not a substitute for safety training from an authorized OSHA training source. Locking out and tagging equipment is one of the most basic safety procedures in general industry and maintenance work, especially in […]
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Deburring copper tubing (often called reaming) is the practice of running a blade around the inside of tubing after you cut it to remove the burr edge from the inside. It's an important practice and should be performed whenever possible. Deburring reduces turbulence inside the lines, as burrs can cause turbulence. HOWEVER… YOU MUST […]
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This photo is of a blower door test we performed at my own house using a Retrotec blower door. You will notice the 15-passenger van outside the window, which is a dead giveaway. A blower door is used to measure the tightness of a building and is often discussed in terms of an ACH50 number. […]
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