Thread Number: 35850  /  Tag: Recent Vacuum Cleaners from past 20 years
Shark Week- an experiment
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Post# 384669   1/22/2018 at 20:05 (269 days old) by blackheart (North Dakota)        

I've often wondered about how quickly a Shark loses it's airflow. I made the decision to only use my Shark UV795 for one week and see how it's flow changes day by day. I figured i'd end up losing about 30% of it's airflow.

The first step was washing the pre motor filters, and the dust cup then checking the hepa filter. The unit has received little use but I wanted to ensure it was performing to the best of it's ability. Then when everything was dried and ready a nozzle airflow test was taken. I think I may have messed up my previous nozzle airflow reading. Probably held the gauge backwards....this reading was a fair amount higher.

To give some background i live in a 1 bedroom apt I think my living space is in the mid to high 600s for square footage. 1 occupant 1 cat. So it's pretty safe to say in most cases the airflow loss would occur more rapidly.

The dust cup was dumped at the end of each vacuuming session to ensure as little got into the filter as possible.

I was expecting a more Linear result so it was quite surprising.

In a small living space with little traffic 21% of it's airflow was lost in 7 days....To me that's pretty bad. No user is going to wash their filters on a weekly basis....hell you'd be lucky if you could get them to do it monthly I'd honestly hate to think how much flow would be lost in an actual household.

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Post# 384674 , Reply# 1   1/22/2018 at 22:02 (269 days old) by vacuumdevil (Denver)        

vacuumdevil's profile picture
Interesting to document those results . I've always noticed that most Bagless vacuums lose their efficiency almost immediately. I always tell customers to wash their filters after every use.

This further proves the reason why Bagless vacuums are kind of nonsense.

What is the model of air flow meter using?

Post# 384678 , Reply# 2   1/22/2018 at 22:37 (269 days old) by Kirbysthebest (Wichita, KS)        
Good information

Well done.

Post# 384684 , Reply# 3   1/23/2018 at 10:42 (269 days old) by Mike811 (Finland)        
Shark torture test + airflow loss

mike811's profile picture
I did very demanding torture test to my Shark NV500.
First I measured the airflow with the clean filters. After that I sucked up big pile of flour and then measured it again. I did this several times.
Later in the test I added more flour + sugar + salt. It took a lot before the airflow dropped. Now for some weird reason airflow got higher after the first measurement. I can't find explanation for it.
Of course the airflow finally dropped after all the torture.
Very little got through to the post motor filter area.

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Post# 384709 , Reply# 4   1/23/2018 at 17:29 (269 days old) by blackheart (North Dakota)        

Same as Bill/Wyaple/Vaclabs GM8901 Anemometer

Post# 384744 , Reply# 5   1/24/2018 at 10:38 (268 days old) by Mike811 (Finland)        

mike811's profile picture
blackheart: I think that your video was more realistic. You used the Shark in normal use and you had more precise air flow meter. I have just the baird meter what I bought from the,
I am still very confused what happened in my video.

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