I'm thinking of adding some vents and possibly a fan to a plastic enclosure of a DC to DC converter to allow heat to escape. Currently the enclosure is sealed (not water-tight, but splash resistant) including sealed connectors and a tight fitting lid. It is not imperative that it is water-tight in any way. It only needs to be splash and dust/dirt resistant at best.
Obviously any vents and/or fans would compromise the water and dust/ dirt resistance. I figured there must be some material made specifically for this application (water and dust resistant, yet allows good airflow) but my numerous searches are coming up short. I was wondering if you guys have used such a material or can at least point me in the right direction as far as searching for it?