EEVblog #1295 - What Makes A Good Lab HEPA Air Filter? - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: March 25, 2020, 10:45:02 pm
content: What makes a good lab HEPA air filter and purifier?

author: johnlsenchak
author_rank: Frequent Contributor
timestamp: March 26, 2020, 01:48:04 am
content: I don't know Dave here in Florida ( in the good old USA, not Aussie Land) 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.

author: NiHaoMike
author_rank: Super Contributor
timestamp: March 26, 2020, 03:09:57 am
content: Quote from: johnlsenchak on March 26, 2020, 01:48:04 amLook again, that unit does run on 240V. That said, best efficiency would be a BLDC motor.

author: johnlsenchak
author_rank: Frequent Contributor
timestamp: March 26, 2020, 03:22:28 am
content: Quote from: NiHaoMike on March 26, 2020, 03:09:57 amThanks for reminding me that Australia , along with the "Old Dart" run on 240 mains for electrical devices

author: Zucca
author_rank: Unknown
timestamp: March 26, 2020, 09:00:58 am
content: Quote from: NiHaoMike on March 26, 2020, 03:09:57 amA DIY unit without ionizer and BLDC motor would be soo chaper, that said a used Blueair in Ebay is not so expensive.

author: Kleinstein
author_rank: Super Contributor
timestamp: March 26, 2020, 09:55:08 am
content: Quote from: johnlsenchak on March 26, 2020, 01:48:04 amThe 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.

author: Zucca
author_rank: Unknown
timestamp: April 14, 2020, 07:42:59 am
content: I just want to drop a line regarding the prices,225€ - 650E used no filters160€ - 270E used with new carbon filter300€ - 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...

author: Lord of nothing
author_rank: Super Contributor
timestamp: May 26, 2020, 10:18:33 am
content: 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

author: Zucca
author_rank: Unknown
timestamp: June 30, 2020, 07:36:20 am
content: https://www.ebay-kleinanzeigen.de/s-blueair/k0

author: Lord of nothing
author_rank: Super Contributor
timestamp: June 30, 2020, 10:53:17 am
content: sadly so far away.

author: Kitesurfing
author_rank: Newbie
timestamp: June 30, 2020, 11:26:05 am
content: 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 on1) 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

author: EEVblog
author_rank: Unknown
timestamp: July 06, 2020, 11:16:06 am
content: Fran has been having a lot of problems with her BlueAir's