ahaucnx

23 ms·

271.
by ahaucnx 3y ago
This was an issue we had in one of the previous versions of the kit. Since then we have improved the hardware (now at version 4.2) as well as fixed it in the firmware. If you still have issues, please contact me through the link on my profi
272.
by ahaucnx 3y ago
Yes, this is what I am doing in my house. Pump the cleaned fresh air into the peripheral rooms (mostly bedrooms) and then this actually pressures the whole house (living room, bathrooms etc).
273.
by ahaucnx 3y ago
No, we only tested with true HEPA filters. One important thing to point out with PPS systems is that you need to get the air from fully polluted to zero polluted in ONE pass as unlike air purifiers, there is no recirculation. So the filter
274.
by ahaucnx 3y ago
As far as I know the Aranet uses NDIR CO2 sensor modules from SenseAir. We do use the same brand in our DIY kits and they are very accurate and probably one of the best low-cost CO2 sensors.
275.
by ahaucnx 3y ago
The R2 is between the tested monitor and the AQMD reference instruments (BAMs and Grimms). They also test if the two reference instruments agree with each other before calculating the correlation to the tested monitor. So I believe their te
276.
by ahaucnx 3y ago
We currently don't have PoE but since it's open hardware and firmware people can look into adding it themselves. All documentation is open source.
277.
by ahaucnx 3y ago
Thank you for mentioning our kits. The Open Air outdoor monitor has been designed in co-operation with scientists and is currently undergoing co-location testing on four continents to collect a large dataset and being able to completely und
278.
by ahaucnx 3y ago
Author here. I wrote this article a few weeks ago after discovering that a well known air quality monitor in the market that retails for more than USD 1000 actually uses a PM module that costs less than USD 20. Often people assume that the
279.
by ahaucnx 3y ago
The system that I am having in place now is connected to our indoor air quality monitor and constantly regulates the fan speed of the PPS. By measuring the CO2 levels in the room, I can also detect when the room is actually occupied. This w
280.
by ahaucnx 3y ago
I have seen PPS systems work from small rooms to whole sports halls. If you have a large temperature/humidity differential between inside and outside, I would recommend looking for units with heat recovery system.
281.
by ahaucnx 3y ago
1) The first DIY PPS that I built used a small duct fan drawing air from outside and pushing it through a hepa filter to the inside. It is important to use duct fans as you need to create air pressure more than air flow and box fans are not
282.
by ahaucnx 3y ago
The positive pressure system is from a local supplier in Thailand and only available in Thailand and China. PM me if you need more information.
283.
by ahaucnx 3y ago
The DIY box fans are a good emergency solution but with climate change these events will become much more frequent and more permanent solutions to make your house safer should be looked at.
284.
by ahaucnx 3y ago
I agree, if you have a modern house you could bring down the levels with air purifiers but having no fresh air exchange really makes the house feeling very stuffy and you could get into very high CO2 levels which have its own set of health
285.
by ahaucnx 3y ago
Author of the article, happy to answer any questions. A bit of background, my house is in Northern Thailand that has similar levels of air pollution every year than what we see currently in North America and Canada and it took me a few year
286.
by ahaucnx 3y ago
Working in this field and living in Northern Thailand which has similar high levels of air pollution from wildfires every year, I have spend many years making my house safe from air pollution. Box fans with HEPA filters are a good immediate
287.
Air quality monitors: paying more does not get you more accuracy(airgradient.com)
369 points by ahaucnx 3y ago|213 comments
288.
by ahaucnx 3y ago
We maintain an open source, open hardware air quality monitor project that is quite popular. We also sell these monitors as easy to assemble kits. One of the monitors is an outdoor monitor similar to the Purple Air that uses dual PM sensors
289.
Open Source DIY Air Quality Monitor Kits(airgradient.com)
1 points by ahaucnx 3y ago|0 comments
290.
Air Purifier vs. Positive Pressure Fresh Air System – An Unfair Battle?(airgradient.com)
226 points by ahaucnx 3y ago|115 comments
291.
by ahaucnx 3y ago
I am impressed by the amount of people you have on your newsletter mailing list. Can you share how you got so many sign-ups?
292.
Reduced Oxygen Intake Linked to Extended Lifespan(neurosciencenews.com)
3 points by ahaucnx 3y ago|0 comments
293.
Air Quality Monitors: When Paying More Does Not Get You More Accuracy(airgradient.com)
3 points by ahaucnx 3y ago|0 comments
294.
The Link Between Climate Change and Air Pollution(airgradient.com)
2 points by ahaucnx 3y ago|0 comments
295.
by ahaucnx 3y ago
I am maintaining a popular open hardware indoor air quality monitor project [1] and it's great to see more and more projects in this space. I like the small footprint and portability of this pocket CO2 monitor so congratulations on pub
296.
by ahaucnx 3y ago
You can get SCD40s on AliExpress for under USD 15. I bought a few and around 20% did not work and some had some weird data patterns occasionaly.
297.
Health Impacts of Air Pollution Across the Life Course [pdf](london.gov.uk)
2 points by ahaucnx 4y ago|0 comments
298.
AirGradient Open Air, Open Hardware Outdoor Air Quality Monitor(airgradient.com)
1 points by ahaucnx 4y ago|0 comments
299.
by ahaucnx 4y ago
I just wrote this post about accuracy vs price of air quality monitors. Interested to hear your experiences!
300.
Air Quality Monitors: When Paying More Does Not Get You More Accuracy(airgradient.com)
1 points by ahaucnx 4y ago|1 comments

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