4 ms·

$1000? I have a (true) HEPA air filter I use at home to keep allergies and dust down and it was only around $150. Still a lot more than this trick but damn that

$1000? I have a (true) HEPA air filter I use at home to keep allergies and dust down and it was only around $150. Still a lot more than this trick but damn that's expensive.

guelo 12y ago
And your air filter was probably made in China.
- homulilly 12y ago
  Yep. That is some insane (not to mention, evil) price gouging going on there.
seanmcdirmid 12y ago
These $1k filters are designed for 2.5 ppm particles, not dust (10 ppm) and allergens. China's air problems are quite different from the west's. Your $150 filter would be completely unsuited.
- colechristensen 12y ago
  There's some cognitive dissonance going on here. All that he's doing is buying HEPA filter media and strapping a fan to it. You _can_ spend $1000 on a fancy plastic enclosure with a fan and the same media, but you don't have to. This seems to be a product created for people who will pay a large amount for something simply because it is expensive. (perceived quality) This [1] is what I have, it is $130 and rated to capture 99.97% of particles > 0.3 µm and is as far as I can tell as good as or better than the filters he is using/selling. Having searched extensively, I could not find a higher class HEPA filter which was not built for a laboratory environment. >These $1k filters are designed for 2.5 ppm particles, not dust (10 ppm) and allergens. The units you are using 'parts per million' don't make any sense in this context. [1] http://www.amazon.com/Honeywell-50250-S-99-97%25-Round-Purifier/dp/B00007E7RY http://www.amazon.com/Honeywell-50250-S-99-97%25-Round-Purif...
  - seanmcdirmid 12y ago
    I have a blue air, like most expats in Beijing. The other air filters are just cheap pieces of crap. There is no dissonance, we've tested them all and the blue air is the only one that actually allows us to sleep on a crazy bad air day. Tell me, did they test those filters on 800 2.5 ppm days? Because that is what they have to deal with here...there is a scandal in the states whenever the level reaches 100, which is labelled as "unhealthy" but we refer to as "clean air." They've also got to be able to push some serious volume, as the whole apartment needs to be filtered (many of my colleagues have multiple $1k units for this reason, do you really want your kids sleeping with you at night?). Just check out: http://aqicn.org/city/beijing/m/ http://aqicn.org/city/beijing/m/ And right now we are in clean air season (winter is much much worse).
- rahimnathwani 12y ago
  The HEPA filter will also become ineffective really quickly unless you have a pre-filter to get rid of the larger particles first.
  - seanmcdirmid 12y ago
    They have multiple levels of filters. We have plenty of 10 ppm also, but the killer is the 2.5.
- homulilly 12y ago
  I don't understand what you mean by parts per million in this context and googling it is literally just bringing me back to this thread.

$1000? I have a (true) HEPA air filter I use at home to keep allergies and dust down and it was only around $150. Still a lot more than this trick but damn that's expensive.

guelo 12y ago

And your air filter was probably made in China.

homulilly 12y ago
Yep. That is some insane (not to mention, evil) price gouging going on there.

seanmcdirmid 12y ago

These $1k filters are designed for 2.5 ppm particles, not dust (10 ppm) and allergens. China's air problems are quite different from the west's. Your $150 filter would be completely unsuited.

colechristensen 12y ago
There's some cognitive dissonance going on here. All that he's doing is buying HEPA filter media and strapping a fan to it. You _can_ spend $1000 on a fancy plastic enclosure with a fan and the same media, but you don't have to. This seems to be a product created for people who will pay a large amount for something simply because it is expensive. (perceived quality) This [1] is what I have, it is $130 and rated to capture 99.97% of particles > 0.3 µm and is as far as I can tell as good as or better than the filters he is using/selling. Having searched extensively, I could not find a higher class HEPA filter which was not built for a laboratory environment. >These $1k filters are designed for 2.5 ppm particles, not dust (10 ppm) and allergens. The units you are using 'parts per million' don't make any sense in this context. [1] http://www.amazon.com/Honeywell-50250-S-99-97%25-Round-Purifier/dp/B00007E7RY http://www.amazon.com/Honeywell-50250-S-99-97%25-Round-Purif...
- seanmcdirmid 12y ago
  I have a blue air, like most expats in Beijing. The other air filters are just cheap pieces of crap. There is no dissonance, we've tested them all and the blue air is the only one that actually allows us to sleep on a crazy bad air day. Tell me, did they test those filters on 800 2.5 ppm days? Because that is what they have to deal with here...there is a scandal in the states whenever the level reaches 100, which is labelled as "unhealthy" but we refer to as "clean air." They've also got to be able to push some serious volume, as the whole apartment needs to be filtered (many of my colleagues have multiple $1k units for this reason, do you really want your kids sleeping with you at night?). Just check out: http://aqicn.org/city/beijing/m/ http://aqicn.org/city/beijing/m/ And right now we are in clean air season (winter is much much worse).
rahimnathwani 12y ago
The HEPA filter will also become ineffective really quickly unless you have a pre-filter to get rid of the larger particles first.
- seanmcdirmid 12y ago
  They have multiple levels of filters. We have plenty of 10 ppm also, but the killer is the 2.5.
homulilly 12y ago
I don't understand what you mean by parts per million in this context and googling it is literally just bringing me back to this thread.