I got the upgraded H13 chamber filter from ali. Construction looks good, but will have to dissect it after use to know for sure.
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Super interested in whether the carbon is actually acid free. You should put one in a box with a fan blowing through it and onto some freshly cleaned metal parts to see if they rust.
I dont doubt the carbon is acid free, Im more concerned with how much is in there, the type and the H13 filter quality. Wont know until i cut it open.
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I would honestly feel more confident in designing a new filter that allows us to add an Amazon big brand h13 and add our regular nevermore-like carbon. I honestly dont trust Hepas from Ali very much and would be very afraid of acidic carbon
Since its easy to design a new filter that allows for these, I think its not worth the risk. Bey hey – i commend you for your bravery
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@maximit I’d actually do the screw test at least for 24h… Just in case…
Sure ill throw in some screws in a bag with the filter for a few days, i am still on the OEM filter.
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Yeah I stuck all the extras on I would like to see in it so I could get an idea of costs - anything other than external extraction with the intake filter makes little sense.
Wasn’t getting mad, 0 3D printing experience or knowledge, hence building the AQMs to get some actual data for my environment and building multiple AQMs to rule out data errors. Just establishing that I wasn’t a complete novice when it comes to airflow or filtering 
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