HEPA filter

Description
This is very simple design for hepa filter! This filter can have one or two 12v turbofan (example: https://www.ebay.it/itm/DC-12V-24V-Cooling-Fan-Blow-Radial-Hot-End-Extruder-50mm-For-3D-Printer-Parts/192192426968?hash=item2cbf8fb3d8:m:my0wC3921GaHkZdEIbQva5w)For the version with 2 turbofan you can simply print HEPA filter.
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