Correct. Each coupler introduces some friction and changes in air pressure. A single 100 ft section of hose will experience less CFM loss than four 25ft sections linked with couplers. However, this difference should be negligible. You've potentially inspired a follow-up video 🤔
The first test he said was pressure but that appears to be false, it should be vacuum! For the 2nd test, he said it had about 88 lbs. of pressure! What?. Still was interesting. Would like to see a test with 2 1/2 inch hose and with different vacuums with a higher CFM.
You should also mention, with longer hose. It will take longer to reach the max lift. Higher cfm with get you to max lift faster. Also, another test would be testing the cfm and lift with liquids running through. Also, if you have foamy detergent, that will drop your cfm down to nothing. I have a 500cfm machine, and i noticed a huge vacuum lost with foam. It's probably because it's lighter than water and harder to extract.
That's interesting 🤔 We haven't tried foam before. It makes sense that varying density of liquids would have varying effects on performance. We might have to make a Part III 😅 Love the carpet cleaning videos, btw. Very satisfying🙌
