My electronics workbench suffers from a lack of fresh air. When I’m soldering, it’s nice to have the fumes from the flux and solder diverted from my face.
The plans are for Proofgrade Medium Draftboard (3.35mm thick).
Mine fit together tightly without glue. I haven’t made any special affordances for changing the filter; I just pull off one of the side panels to replace the filter element.
There is a fourth large panel that helps keep fingers out of the fan, but it’s not full protection. You can glue a piece of mesh in between the guard panel and the panel that mounts the fan.
When assembling, mount the fan to its panel first.
The carbon filters are the same ones used by the off-the-shelf solder fume extractors. They seem to help quite a bit if the smoke gets captured by the draft. My fan is a beefy 120VAC unit that came from a piece of scientific equipment from the '90s.
I use a little battery-powered fan to just pull the fumes away and make no attempt to filter it. Ideally I would vent outside my workspace, but maybe I should look into something like your filter.
A bit off topic but you seem like the sort that might like this:
They throw a ton of air for their size, and are USB rechargeable with an internal 18650 battery. I keep a few spare batteries handy in case I need to do a quick change, but yeah, definite thumbs up for drying paint, moving air, starting charcoal, you name it.