Goldstream Sovereign Pressure Hatch

From what I see on the virtual tour of their site, it's the same small hatch in my van - often termed a scupper (which it seems technically it is not) you can leave it open to catch the breeze when mobile on gravel roads - the inward airflow 'pressurises' the van body to an extent and reduces the tendency of dust to get in anywhere else in the - just tried my vent over 400km or so in WA and it works quite well ! Being quite low on yours though when the camper is closed, you'd want to be sure you weren't taking in dusty air.

I have one.The first time we used it on a dirt road, (130km) with the hatch open When we arrived at our destination the camper was full of dust. We now travel with it closed, and get minimal dust in.
Brian

another One-Use-User here... the one time we used it we got the most dust in we ever have.

might work on sealed roads.. but then nothing to keep out anyway...
might work on dirt roads... if you never meet someone coming the other way...