Air is Squishy – Measuring Airflow w/ Bill Spohn

Measuring airflow is easy. Measuring airflow accurately is quite a bit more difficult. In many cases, when we as technicians measure airflow, we are trying to get to the almighty CFM (cubic feet per minute) volume measurement. You can take CFM readings fairly easily with a hood, like the Testo 420, but even a hood has some limitations when the goal is to measure total system CFM vs. register/grille CFM.

In this series of videos, Bill Spohn from TruTech tools demonstrates all of the tools you can use to measure airflow from hot wire and rotating vane anemometers to flow hoods, smart grids, and pitot tubes, all the way down to using a GARBAGE BAG.

I had the privilege of seeing this presentation in person (I am the one behind the camera), and I wanted to share it with you. It is well worth your time.

—Bryan

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Related Tech Tips

How to Use the Progress Ratchet
Do you remember the first time you used a ratchet? Neither do I, but I DO remember the context in which I first used one. In order to understand my story with ratchets, I need to introduce you to my grandpa, Don, the man who I have always called “Papa.” My grandpa has done so […]
Read more
Relative Humidity in the Supply Air Stream
When you first start checking your supply air with a thermo-hygrometer, you may notice that the relative humidity is REALLY HIGH. Often, the RH in a supply duct will be between 85% and 96% relative humidity on a system that is functioning as designed. The reason for this is fairly simple: In order for dehumidification […]
Read more
Vacuum Pump Oil
This article is written by Sal Hamidi, founder of Productsbypros.com, an innovative manufacturers representative agency that promotes great HVAC/R products through training and media. You can reach Sal at Sal@productsbypros.com.   If we are going to discuss vacuum pump oil, it's important to understand what it is first. Most HVAC application vacuum pumps are rotary […]
Read more
loading

To continue you need to agree to our terms.

The HVAC School site, podcast and daily tech tips
Made possible by Generous support from