Curious why you want to filter the exhaust when the intake is "fresh air".
Do not let air cycle in the box, it will cause it to overheat.
Try without a duct fan. The asic is basically a duct fan itself.
Use this guide as a reference when building your enclosure: https://econoalchemist.github.io/UpstreamData-DIY-BlackBox/
Interestinnnnnng.
Filter the VOCs man. Hot plastic and metals etc. Rather not breathe it.
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