Thread Number: 34180  /  Tag: Recent Vacuum Cleaners from past 20 years
Scientific Carpet Testing
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Post# 370341   4/9/2017 at 09:20 (376 days old) by Tseg (World Traveller)        

We've all seen the videos where a Sebo or Miele vacuums a carpet after a Dyson is finished and continues to pull up debris... but what if that Dyson made 1 more pass, would it also pull up that debris?

Is anyone aware of more scientific carpet cleaning analysis, maybe analyzed with macro-photography? ... or the use of translucent fibers and colored dirt in a laboratory?... or determining what CFM is the minimum to pull certain kinds of debris? For as long as vacuums have been around and as hi-tech as some are, and some of the labs of manufacturers seen in videos I would think actual scientific assessment of actual cleaning ability would have been developed. Maybe it exists and I just have missed it? Maybe standardized density and weight of debris, standardized carpeting... parts per million sucked up per second? I don't know. I see the EU tag assessment, so assume they have tried to standardize the process, but have not really seen a lot of content about it.

I've seen hours of footage of vacuums sucking up globs of pet hair, or snow-plowing it, and paper-towel tugs-of-war, but it seems to me so much of the "proof" shown on the web (or in at-home demonstrations) is so unscientific. Yes, 150 CFM at the nozzle can clean a carpet thoroughly (and what does 'thoroughly' or 'deep' really mean... scientifically?), but what about 100 CFM? 80 CFM? 50 CFM? what does the cleaning curve look like? I assume there would be some type of bell curve drop off... when does that happen? Is 100 CFM and 150 CFM within 2% or each other relative to sucking debris but 80 CFM at 50% lower performance? There has got to be an 'over-engineering' point for all these different things, but I never see them spelled out. Does my floor that shakes with the latest 40 horse power titanium agitator force significantly incremental debris removal than an air-powered plastic agitator? How can you prove it scientifically? By how much? Inquiring minds want to know.

Post# 370342 , Reply# 1   4/9/2017 at 09:51 (376 days old) by sebo4me (Cardiff)        

sebo4me's profile picture
I have always wondered this too.

CRI are supposed to have an accurate test for carpet pick up. So they say 😉

Post# 370350 , Reply# 2   4/9/2017 at 12:25 (376 days old) by sptyks (Skowhegan, Maine)        

sptyks's profile picture

Tsg and Sebo4me,


Here is a link to CRI's testing procedures for vacuum cleaners. It doesn't get any more scientific than this. Oh yes, you will need a PDF reader to read these testing procedures:



Post# 370354 , Reply# 3   4/9/2017 at 12:50 (376 days old) by sebo4me (Cardiff)        

sebo4me's profile picture
I'm not totally convince by CRI testing. For instance the Oreck Magnesium gets a Gold award. In the UK it's gets an Email rating for carpet pick up wihch is very poor.
Some vacs that's only have a standard foam filter get a gold rating when the filtration is clearly sub standard. There is quite a few discrepancies!

Post# 370355 , Reply# 4   4/9/2017 at 12:51 (376 days old) by sebo4me (Cardiff)        

sebo4me's profile picture
E rating. Predictive text! 😏

Post# 370377 , Reply# 5   4/9/2017 at 15:04 (376 days old) by wyaple (Pickerington, OH)        
My Flour Under The Carpet Tests Reveal That...

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Deep cleaning below the medium pile carpet backing requires minimum nozzle CFM of:

80 CFM for entry level results,
100 CFM for good results and,
120 CFM for nearly perfect results,

if the user wants to get very fine deep down dirt (dust) in no more than two complete passes (not 8-10 or more in typical lab tests). While I haven't done 1 pass tests yet, I would surmise that 120 CFM would get 95% of fine dust in just 1 complete medium speed pass.


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