[geerlingguy]

In a garage environment, using mesh everywhere and ensuring there are zero openings like an empty PCIe slot is the best solution.

Outdoors you need special enclosures typically made for industrial computers; and many companies build special fanless enclosures that dump heat directly through the metal enclosure (it is basically the heat sink).

Others have fan designs that have their intake and exhaust through filters on the bottom.

[metadat]

Yeah, I haven't yet researched what kind of mesh to use, any recommendations there? Thank you!

[geerlingguy]

Honestly in a pinch I've used screen door mesh from the hardware store, and gaff tape.

Otherwise, search online for 'PC dust mesh filter' and it usually is sold in rolls.