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All Raise3D have top Clear sound covers

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Your problem is so simple and still you ask for help to figure it out.

Bye the way it is a "High efficiency particulate air (HEPA)" no not know what a HERA filter is.

Your problem is as simple...

How about a window vented AC Duct

https://www.repairclinic.com/PartDetail/Duct-Assembly/COV31735401/2754508

Remember you have a 3D Printer 3D Print your own, wanted to give you an Ideal.

I...