Thank you all for your answers. I would like to measure the flow, but I can't really. I'm in sales engineering, and don't have the equipment to do so... and my client, which is the one who has that application, doesn't either.
I got an answer from a friend of mine. What about wind turbine...
Hello everyone, I need to calculate volume flow and I'm having a hard time doing it, help please.
A 1.5HP turbine at 3000 rpm, drives a fan, 14 inch in diameter. It takes it from ambient air to blow it into a duct heater. How much cubic feet per minute (CFM) of air does it move?