Hi, I'm Brian war with the HVAC school podcast. I'm doing this video real quick to show you the 410 I and how you can use it to measure velocity and then how you can convert that into volume flow in general in a residential air conditioning supply duct. We want to see velocities anywhere from three hundred feet per minute to about 700 feet per minute. I've intentionally set really low velocities on this.

For the purpose of having low air noise going to be doing a time to average Traverse, you can see, I've got it's already set in a 12 inch by 12 inch 55 % free area that is off the specs. For this actual event, you have to look carefully at the specifications for the vents in order to find that, but in general - and you can use this to average the velocity and paint the entire vent. So I've hit the button and now the clock is running. I've stopped the measurement now at 46 seconds so now all we have to do is just hit the little square with the circle around it, and now it gives me my average reading.

You can see here that we have an average of 106 CFM but again in order to get that you would have to know quite a bit about your vent, but we do know that my average velocity is a hundred ninety-three feet per minute. That's pretty low! In this case, I know that I oversize the duct, but in many cases it would result in not having enough throw so that's how you can use the test. Oh for 10, I part of the new expanded smart probes case in order to measure airflow at an outlet, as well as your velocity, thanks for watching.