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> Normally a high CO2 level will go hand in hand with the air feeling stuffy from other pollutants that build up at the same time, so there's hardly a need to c

> Normally a high CO2 level will go hand in hand with the air feeling stuffy from other pollutants that build up at the same time, so there's hardly a need to continuously use a CO2 meter as you can easily notice when the air "goes bad" Strong disagree based on direct experience. I have a HEPA unit that keeps air in the entire living unit clean (from VOCs, particulate matter, NO2, etc.) but doesn't alter CO2 levels. There is little to no human-detectable effect from CO2 levels rising up to 2500ppm (according to my separate CO2 monitor).

dfadsadsf 4y ago
HEPA filter does not do much for VOC. VOCs, because they are gases, are about 1000 times smaller than what HEPA filters can capture. You need carbon-based filter to neutralize them.
- not_kurt_godel 4y ago
  My unit has both HEPA and carbon-based filters. The point is, my CO2 levels rise independently of any other pollutant and it's not reliably detectable by a human as far as I can tell.
  - Filligree 4y ago
    How often do you swap the carbon filter? My understanding, admittedly driven by 3D printing, is that they only last about a week before the substrate degrades. Fortunately activated carbon is cheap.
    - not_kurt_godel 4y ago
      Variable, between 6 months and a year, per the manufacturer's recommendation and unit's ability to sense when the filter needs replacing. It seems like you're saying yours only last a week because you're constantly generating fumes from 3D printing? I don't do anything like that. I would be curious to get some kind of independent measurement of effectiveness of a new filter over time (and I suppose I will from my air monitor next time I replace). But again, the point is my separate air quality monitor shows increases in CO2 that are not associated with rise in any of the other 4 detectable pollutants it measures.
      - Filligree 4y ago
        What I’ve been told is that the carbon filter will stop absorbing VOCs after a week, regardless of how much I use the printer. Considering that some of them are carcinogens, I’m not taking any chances. Presumably this should also hold for other carbon filters, then, but I don’t know how I would verify that.

dfadsadsf 4y ago

HEPA filter does not do much for VOC. VOCs, because they are gases, are about 1000 times smaller than what HEPA filters can capture. You need carbon-based filter to neutralize them.

not_kurt_godel 4y ago
My unit has both HEPA and carbon-based filters. The point is, my CO2 levels rise independently of any other pollutant and it's not reliably detectable by a human as far as I can tell.
- Filligree 4y ago
  How often do you swap the carbon filter? My understanding, admittedly driven by 3D printing, is that they only last about a week before the substrate degrades. Fortunately activated carbon is cheap.
  - not_kurt_godel 4y ago
    Variable, between 6 months and a year, per the manufacturer's recommendation and unit's ability to sense when the filter needs replacing. It seems like you're saying yours only last a week because you're constantly generating fumes from 3D printing? I don't do anything like that. I would be curious to get some kind of independent measurement of effectiveness of a new filter over time (and I suppose I will from my air monitor next time I replace). But again, the point is my separate air quality monitor shows increases in CO2 that are not associated with rise in any of the other 4 detectable pollutants it measures.
    - Filligree 4y ago
      What I’ve been told is that the carbon filter will stop absorbing VOCs after a week, regardless of how much I use the printer. Considering that some of them are carcinogens, I’m not taking any chances. Presumably this should also hold for other carbon filters, then, but I don’t know how I would verify that.