Thread Number: 35343  /  Tag: Recent Vacuum Cleaners from past 20 years
Airflow Measurements and Loss Of Airflow
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Post# 380226   10/24/2017 at 15:07 (333 days old) by Mike811 (Finland)        

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So I measured airflow behavior of the two bagged vacuums Nilfisk GM80 (mid 90's) and Philips P74 Electronic (mid 80's) + bagless Dyson DC40.
In my bagged vacuums test I also tested the loss of airflow when the bag was almost full so I could see the amount what they lost cfm.
With the Dyson I measured it like it was, then with using just a empty bin without the small cyclones and straight from the motor.
Pictures speak more than thousand words.

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Post# 380227 , Reply# 1   10/24/2017 at 15:09 (333 days old) by Mike811 (Finland)        

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Sorry some pictures came twice

Post# 380228 , Reply# 2   10/24/2017 at 15:11 (333 days old) by Mike811 (Finland)        
Empty & partly full bag

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Philips with empty & partly full bag

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Post# 380230 , Reply# 3   10/24/2017 at 16:26 (333 days old) by huskyvacs (Northern Indiana)        

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Be careful Thomas Dyson doesn't see this, he will try and sue you next! [joke]

Post# 380231 , Reply# 4   10/24/2017 at 16:27 (333 days old) by huskyvacs (Northern Indiana)        

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Whoops typo, James Dyson.

Post# 380232 , Reply# 5   10/24/2017 at 17:41 (333 days old) by Mike811 (Finland)        
Haha :)

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I guess then I have to make those measurements in the courtroom :D

Post# 380259 , Reply# 6   10/25/2017 at 14:46 (332 days old) by Rolls_rapide (Scotland)        

Can your Philips cylinder cleaner be fitted with a paper dustbag?

Post# 380260 , Reply# 7   10/25/2017 at 14:51 (332 days old) by Rolls_rapide (Scotland)        

Apparently it can...

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Post# 380270 , Reply# 8   10/25/2017 at 20:19 (332 days old) by Mike811 (Finland)        

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Yes I can still get those bags. They are called Amsterdam. I can also retrofit hepa/fleece bags for it. You can see the gray pipe fitted to the bag door.

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Post# 380311 , Reply# 9   10/26/2017 at 19:14 (331 days old) by wyaple (Pickerington, OH)        
Great Video Mike, But I Have A Question

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You have two pictures of your Nilfisk pulling a "Baird" 10, which is 110 CFM. BUT, in one pic, you have stated 123 CFM and another 115 CFM. Did you purchase some other anemometer to measure past 110 CFM? Anyway, here's the Baird CFM chart again for reference.

Keep those videos coming!


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Post# 380332 , Reply# 10   10/27/2017 at 14:34 (330 days old) by Mike811 (Finland)        

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Oops my mistake. I don't know why I put 123 cfm in the video, but right is obviously 110 cfm.
So Nilfisk pulled 10 (110 cfm) with the empty and half full bag.


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