PCU (pollution control unit)

• 4“ inlet at top
• Side-by-side 20×16 furnace filters
• Screen bed of activated charcoal granules
• 4” outlet at bottom

https://wiki.milwaukeemakerspace.org/projects/lasercutterventingsystem?s[]=laser&s[]=exhaust#verison_52_-_lenox_mar_2017_-_mar_2017

Could not pull suction through it.
Drawers needed latches or gaskets. MDF panels were too leaky even after painting them with glue and caulking the joints.
Disassembled and used for scrap on other projects.