'urban camouflage'. I've done almost all my odds with the intent of keeping a low profile. I really don't want it to stand out with a light colored roof.
My old thread on the window fan inserts -
eta MkII design start further down the topic, here. Something I've been doodling for a while. Seen things like it on police K-9 vehicles. And I want it for a similar purpose and also as something useful for vehicle camping etc. Essentially it's a window insert, trapped in place by the window...
www.expeditionportal.com
Those four quiet fans move the full volume of the vehicle interior, every minute. I put them on a rheostat so they could be dialed down / up, be even more quiet and still move a lot of air.
Lots of material and how to details in the topic. Was almost 3yrs ago.
One other intended mod I still haven't done, but hope to accomplish this winter when I take everything out of the back of the Sub for bunch of re- and new wiring, is add a switched power feed that will let me engage and control speed of the rear AC squirrel cage fan, thus using the vehicle's built in fan and ducting to stir air around the rear platform / sleeping area.
/take THAT run-on sentence, English teachers!