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@maccruiskeen @Infoseepage @briankrebs You could make one to go in an upper corner of a room. Small wooden frame against the walls and ceiling with some door weather striping to seal it against the drywall, two filters, one box fan (or a grid of smaller fans).

The reason for four filters is to get a lot of surface area. With only two, be sure to get the thicker filters with lots of pleating.