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HEPA + active carbon filter

I made this filter to remove the toxic volatile organic compounds and fine particles generated by my 3D printer.
It is about 11x11x20 cm big, and contains a HEPA 13 filter and active carbon pellets.
There is a door on the exhaust pipe to redirect some of the air back into the enclosure, to keep a correct temperature inside.
It is difficult to test its efficiency without proper tools; at least, the smell when I open the enclosure is much lighter now that I use this filter...

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