261–270 of 300 posts
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CO2Meter AZ-0004 https://www.amazon.com/gp/product/B001PDGFR8/
I own this one as well, it's supposed to be one of the more accurate models available for the price
https://www.wnycstudios.org/podcasts/radiolab/articles/g-pro...
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Why is the first step to monitor it, not 'get a HEPA filter & fan / purifier'? Monitoring seems like it's interesting to do if you want to, but if you already know it's an issue, just start addressing it?
Yeah, I'm confused by all the comments saying this too, especially since those detectors are yet another nontrivial expense. If you know you're in a polluted environment, why would you need instrumentation before taking action? To me it's like getting blood work done before you err on the side of exercising.
You need to keep enough ventilation going to ensure you don't exceed 800ppm CO2.
You also need to monitor the PM2.5 levels to ensure your air purifier is working.
An air quality monitoring device is an essential piece of equipment for anyone.
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Curious, did you notice the cognitive effect yourself?
No. But I do notice I think better when jogging - whether that is due to fresh air outside or increased blood flow, who knows. Probably both.
I think this is an important question to answer, but the shehab paper (the first link) provides vertically no useful information. They didn't blind the assessors carrying out the cognitive studies, which on its own invalidates their conclusion. They also didn't randomize the ordering, but appear to have "investigated for order effects", found "no statistically robust difference", then proceeded to have every particip…
The first link on the page isn't a paper. The word shehab doesn't appear anywhere on the page. The word shehab doesn't appear anywhere in the first paper linked. The three quoted sentences / fragments you provide don't appear anywhere in the first paper linked. I opened some of the papers and didn't see any with n=30.
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Yeah, I'm confused by all the comments saying this too, especially since those detectors are yet another nontrivial expense. If you know you're in a polluted environment, why would you need instrumentation before taking action? To me it's like getting blood work done before you err on the side of exercising.
If you're closing up your house to avoid outside air pollution, you will spike your CO2 levels. You need to keep enough ventilation going to ensure you don't exceed 800ppm CO2. You also need to monitor the PM2.5 levels to ensure your air purifier is working. An air quality monitoring device is an essential piece of equipment for anyone.
But if you don't have an air purifier, and you're concerned about air quality, surely you want to get one before you start worrying about whether or not it's working?
Or both at the same time, sure, my only point is that if there's already concern I don't see the point in monitoring before or without mitigating.
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And f) most passive house designs have humidity/mold issues down the road, unless proper and frequent maintenance is done. (I've read about passiv haus and similar a while back).
Mold is only an issue in hot climate. When it's never above 25C / 75F _and_ humidity is controlled, there is never any mold.
https://www.google.com/search?q=cleargrass+air&ie=UTF-8&oe=U...
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Except these heat exchangers have two filters that need cleaning very 3 months and most people never do it, so they don't really function properly.
Is the 3 months interval a regional thing, or based on the heat exchanger? Mine have 1 year intervals, and with a subscription for filters it is easy to remember to change the filters
both. That is it varies between different units but also varies with local conditions, if your local conditions are "heavy-duty" (very high humidity, smog, area with lots of dust or lots of pollens etc.) you should consider replacing more frequently than rated intervals.
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Mold is only an issue in hot climate. When it's never above 25C / 75F _and_ humidity is controlled, there is never any mold.
Never above 25C... so Iceland, Greenland and Svalbard? Actually not even those, they are pretty humid above 0 celzius