V200 Neutral Newbie September 10, 2008 Share September 10, 2008 (edited) Just got my hands on this particle counter for some data collection. After I was done, decided to do a little test on my own. Heared of this HEPA filter before? Well, I tried it with the aircon full blast. See what's the result. Edited September 10, 2008 by V200 ↡ Advertisement Link to post Share on other sites More sharing options...
V200 Neutral Newbie September 10, 2008 Author Share September 10, 2008 Next I removed the "HEPA" filters Link to post Share on other sites More sharing options...
Munkong Neutral Newbie September 10, 2008 Share September 10, 2008 What do the readings mean? Link to post Share on other sites More sharing options...
V200 Neutral Newbie September 10, 2008 Author Share September 10, 2008 Then I measured again. Link to post Share on other sites More sharing options...
V200 Neutral Newbie September 10, 2008 Author Share September 10, 2008 I did not believe the results, so I tested again. Link to post Share on other sites More sharing options...
V200 Neutral Newbie September 10, 2008 Author Share September 10, 2008 (edited) The readings means how much particles there are blowing from the aircon duct per minute. For this case, it was about 1 million 0.3microns particle per cubic feet per minute. (Need to multiply by 10). With or without the filter the readings were simliar. This means that either the air con coil and small ductwork from fan to the air con vents are constantly releasing particles, or the HEPA filters don't work. I personally think the HEPA don't work.It just prevents big particles from getting stuck in the air con coils. Edited September 10, 2008 by V200 Link to post Share on other sites More sharing options...
Ender Hypersonic September 10, 2008 Share September 10, 2008 Did you let the air con run for a few hours or a day before you take the 2nd round of reading? There're residual particles in the air duct after the air filter to your counter, that will take times to clear. Link to post Share on other sites More sharing options...
V200 Neutral Newbie September 10, 2008 Author Share September 10, 2008 No leh. But turning the fan to full blast should clear the residue particles right? At least the readings should show significant difference rather than same for with and without particle filters. Link to post Share on other sites More sharing options...
Ender Hypersonic September 10, 2008 Share September 10, 2008 If you still have the counter on loan, maybe can ty taking the reading again after some usage. Don't know if it'll make a diff. Link to post Share on other sites More sharing options...
Tkseah Supercharged September 10, 2008 Share September 10, 2008 So your test reading is one with HEPA filter and one without any filter?? Link to post Share on other sites More sharing options...
V200 Neutral Newbie September 10, 2008 Author Share September 10, 2008 Yup. My test was done with the HEPA. I removed the filter then took the second reading. Link to post Share on other sites More sharing options...
V200 Neutral Newbie September 10, 2008 Author Share September 10, 2008 The counter won't be with me for long. Doubt I could keep test it again. Anyway, was running the aircon full for 5 mins because I kept taking the readings. Should be accurate. Link to post Share on other sites More sharing options...
Southpark2000 Neutral Newbie September 10, 2008 Share September 10, 2008 (edited) The readings means how much particles there are blowing from the aircon duct per minute. For this case, it was about 1 million 0.3microns particle per cubic feet per minute. (Need to multiply by 10). With or without the filter the readings were simliar. This means that either the air con coil and small ductwork from fan to the air con vents are constantly releasing particles, or the HEPA filters don't work. I personally think the HEPA don't work.It just prevents big particles from getting stuck in the air con coils. I am no salesman of HEPA filter.....but a bit unfair leh - yr testing.....and so is yr title of post - misleading leh..... http://www.cairefresh.com/pdt-automotive.htm [/indent]CaireFresh Edited September 10, 2008 by Southpark2000 Link to post Share on other sites More sharing options...
V200 Neutral Newbie September 10, 2008 Author Share September 10, 2008 Er...did not say brand name of filter hor.... As for the title of the post, I wanted to change but cannot leh. Anyhow, would you believe it, HEPA filters in market has an efficiency of 99.99% depending on grade. This so called HEPA filter has 99% efficiency. However, from the readings, even if you were to take my 0.5 microns readings as 500 difference, isn't that only 10% reduction and virtually no impact on 0.3 microns at all. Can let me know your thoughts, maybe do another test (if can find the time). Link to post Share on other sites More sharing options...
Biglittlebean 3rd Gear September 10, 2008 Share September 10, 2008 Just my opinion, the experiment may not be an accurate one since you have been using the HEPA filter in your aircon in the first place. The air particles may have been filtered out prior to that and hence it already has less particles. That's why when you take out the filter, the readings does not show significant improvement. Perhaps, to make the test fairer, maybe you can take out the filter and use your car for one week first and then do a reading, followed by another week with the filter. Cheers Link to post Share on other sites More sharing options...
Zippaboy 4th Gear September 10, 2008 Share September 10, 2008 how about testing with the recirculation mode off? Link to post Share on other sites More sharing options...
Genie47 1st Gear September 10, 2008 Share September 10, 2008 That is why I buy the OE ones from the car manufacturer. They are cheaper by a wide margin compared to the HEPA ones. 22-24 bucks for the OE compared to a whopping almost 40 for the HEPA. Still need to change every 10k for me. Link to post Share on other sites More sharing options...
Genie47 1st Gear September 10, 2008 Share September 10, 2008 That would be a good variable to investigate. ↡ Advertisement Link to post Share on other sites More sharing options...
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