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Les, all your numbers appear in range, except That RSL4 obviously. Can you re-test? I think Devin tested a similar model awhile back and got around 91 nozzle CFM on high speed. So if 91 CFM on high is correct, instead of: "I got 7007 reading on high speed so 7007 x .034880 is 244.40 cfm."...

That's probably pretty close Zan What I usually do is look at the inner diameter of the detector, since all the airflow will be directed through that opening. The inner "hole" might be ever so slightly bigger than just the vanes themselves. But the rest of your calculations appear to be spot...

First you have understand what suction and Airflow actually are before you attempt to design a test.

One to five microns? The only way to properly test particulate removal is to perform the tests as I have done or purchase a particle generator that can emit fine particulate at the 0.3 micron level. One to five microns is huge. Bill

Full tests are on my YouTube channel I measured 96" at the canister and 92" at the hose end, bag installed. Bill

Well, I was going to say "someone beat this", but I see that Mikko (Vacuumtests on YouTube) has a Philips that uses around 1900 Watts and gets 92 nozzle CFM. Go Mikko! Bill

Les, Where Are You Getting Your Figures? My Sentria II weights 23 lbs. and older G-series machines weigh 24 lbs. So if you have a newer Kirby, it's only 3 lbs. heavier than a 10 Amp Royal. I have two Heritage II Legends and they both weigh 19 lbs. Bill

Forgot to mention that Your Heritage II is stuck running on high speed, which is really just meant for a hose attachment. In low speed, it'll measure right around 120 nozzle CFM. Bill

Hey Devin, I Think You Meant To say that the Sentria 1 gets 127 CFM and the Sentria 2/Avalir gets 137 CFM. :) And that's with only a 7 Amp motor instead of a Royal's 10 Amp motor. Bill

Fabulous results! Does it have a hose? How much power does it draw? Seems like a reasonable result. It appears to be in the same general class (120+ CFM) as the SEBO D4, Tristar CXL, Filter Queen M360 and Henry HVR200. Of course a "hot rodded" Electrolux Marquis with a 12 Amp (1440 Watt)...

Fantastic Results With Staggeringly Similar Airflow measurements from 4300 miles away from Ohio. I get about 120 CFM from my G6. Can't wait to see more tests. Bill

Broomvac, what a strange comment His conundrum is inconsistency of measuring devices, not whether or not air is a compressible fluid. Which it is NOT at normal atmospheric pressure and typical vacuum air speeds. But don't believe me, how about Kim Aaron, PhD in fluid dynamics from Caltech...

In order to fully check consistency you must Use all three vanes on one anemometer and then repeat the same tests with the other two anemomters. That would be 9 sets of "mix and match". And while you're testing for max peak airflow, you must test at least three times over a period of several...

With Near Kirby Sentria II / Avalir Levels of Airflow And a small nozzle area, I would imagine that it doesn't (or it's not recommended) make a seal with the carpet? Without a power assist, the airflow density would be so extreme, it wouldn't be usable on pile carpet. Would owners raise the...

Umm, Devin Are You Sure Those Numbers Aren't Flipped? After dozens of tests over a few years, I have yet to see airflow increase from the hose down to the power nozzle. It always decreases...a lot. Are we to believe the Dirt Devil has 80 hose CFM and 130 nozzle CFM? And the Eureka has 49 hose...

Mark, I'm not blind yet I know Mike's Vorwerk is an upright. Geez. The point I'm attempting to make is twofold. 1) 80 nozzle CFM isn't much to crow about since much cheaper clean air machines can achieve this figure and 2) A 1980 Electrolux Olympia One with a new vinyl hose can get 75 nozzle...

Devin, thanks for the Lux GP measurements I think it's quite a great machine but about a 32 CFM loss from the hose/wand connection down to the PN is very high indeed. Normally, I would post a pic of my Hoover Tempo Widepath (under $100) that does 80 nozzle CFM, but I already did that farther up...

That might work, but some people use Foam rubber weatherstripping, which is usually very inexpensive. I use microfiber cloths because I have a lot of those and they are easily configurable. They look terrible, but work very well. Bill

Mini-Meet #2 Marquis Measurements Are somewhat on the "quick and dirty" side with the Luxes. The Sentria I airflow box is exact (127.4 CFM) as I measured that Kirby several times over several minutes. When using the GM8901 anemometer, please use only this conversion to obtain CFM from...

Since the industry standard airflow hole is Two inches in diameter, the total area of the intake hole just needs to be bigger. So a 2 inch round hole has an area of 3.14 square inches. If your top intake area is say 10" by 1.5", that would be 15 square inches, which is much larger.