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EEVblog => EEVblog Specific => Topic started by: EEVblog on March 25, 2020, 10:45:02 pm

Title: EEVblog #1295 - What Makes A Good Lab HEPA Air Filter?
Post by: EEVblog on March 25, 2020, 10:45:02 pm
What makes a good lab HEPA air filter and purifier?

https://www.youtube.com/watch?v=bPDr0l05CPY (https://www.youtube.com/watch?v=bPDr0l05CPY)
Title: Re: EEVblog #1295 - What Makes A Good Lab HEPA Air Filter?
Post by: johnlsenchak on March 26, 2020, 01:48:04 am


I  don't know Dave  here  in Florida  ( in the good  old USA, not Aussie Land  8))  we just have  air conditioning units  and air handlers  that  do all that , and  the best  part  is the units  have a  better overall  efficiency   because they  run   at   240 volts  A.C.
Title: Re: EEVblog #1295 - What Makes A Good Lab HEPA Air Filter?
Post by: NiHaoMike on March 26, 2020, 03:09:57 am
I  don't know Dave  here  in Florida  ( in the good  old USA, not Aussie Land  8))  we just have  air conditioning units  and air handlers  that  do all that , and  the best  part  is the units  have a  better overall  efficiency   because they  run   at   240 volts  A.C.
Look again, that unit does run on 240V. That said, best efficiency would be a BLDC motor.
Title: Re: EEVblog #1295 - What Makes A Good Lab HEPA Air Filter?
Post by: johnlsenchak on March 26, 2020, 03:22:28 am
I  don't know Dave  here  in Florida  ( in the good  old USA, not Aussie Land  8))  we just have  air conditioning units  and air handlers  that  do all that , and  the best  part  is the units  have a  better overall  efficiency   because they  run   at   240 volts  A.C.
Look again, that unit does run on 240V. That said, best efficiency would be a BLDC motor.


Thanks  for reminding me that Australia ,  along with the  "Old Dart"  run on  240  mains  for  electrical  devices   8)
Title: Re: EEVblog #1295 - What Makes A Good Lab HEPA Air Filter?
Post by: Zucca on March 26, 2020, 09:00:58 am
be a BLDC motor.

A DIY unit without ionizer and BLDC motor would be soo chaper, that said a used Blueair in Ebay is not so expensive.
Title: Re: EEVblog #1295 - What Makes A Good Lab HEPA Air Filter?
Post by: Kleinstein on March 26, 2020, 09:55:08 am


I  don't know Dave  here  in Florida  ( in the good  old USA, not Aussie Land  8))  we just have  air conditioning units  and air handlers  that  do all that , and  the best  part  is the units  have a  better overall  efficiency   because they  run   at   240 volts  A.C.

The choice of filters also depends a lot on the humidity level. The activated coal ones are not really good with high humidity as water can saturate it. So it absolutely makes sense to combine filtering with air conditioning in areas with high humidity. On the other side mold is less of a problem in very dry areas and paper filters can be OK there. 
Title: Re: EEVblog #1295 - What Makes A Good Lab HEPA Air Filter?
Post by: Zucca on April 14, 2020, 07:42:59 am
I just want to drop a line regarding the prices,

225€ - 650E used no filters
160€ - 270E used with new carbon filter
300€ - 450E used with used carbon filter (yes I overpaid a little)

It does not seems too bad as mentioned in this video by Dave.

Anyway to remove the side panels on the 650E and get it proper cleaned (mine had long girl hairs in it):
- Remove the two top screws as Dave did (it did not show that in the video but you can see the screws missing)
- Pull/Push the side panels up, they have a stupid latch which release...


 
Title: Re: EEVblog #1295 - What Makes A Good Lab HEPA Air Filter?
Post by: Lord of nothing on May 26, 2020, 10:18:33 am
Can someone recommend a good europen source for the blueair?
I could not find a good source on ebay. One from US but the have 400$ Tax!  :=\
Thanks
Title: Re: EEVblog #1295 - What Makes A Good Lab HEPA Air Filter?
Post by: Zucca on June 30, 2020, 07:36:20 am
https://www.ebay-kleinanzeigen.de/s-blueair/k0 (https://www.ebay-kleinanzeigen.de/s-blueair/k0)
Title: Re: EEVblog #1295 - What Makes A Good Lab HEPA Air Filter?
Post by: Lord of nothing on June 30, 2020, 10:53:17 am
 :-\ sadly so far away.
Title: Re: EEVblog #1295 - What Makes A Good Lab HEPA Air Filter?
Post by: Kitesurfing on June 30, 2020, 11:26:05 am
Hi All,
I used to design test fixtures with scrubbers which would remove the test smoke from a small room.
The HEPA we used AirePure (Melb,Vic,Aus) AP4931212DB (Filter HEPA 305mmx305mmx70mm)

The rough rule of thumb is the L/min would need to pass the HEPA Filter 8-10 times to fully scrub the room of fine particles.

The guys there will prob know more about applications, but I guess it depends on
1) Size of the Room. Is it for a fume hood about a soldering bench/ Flux etc.
2) L/min you need to flow through the filter - Note the impendence of the Filter can turn a 200Lmin Fan down to 20L/min.

Hope this helps