I appreciate the quick responses! I can understand the "no" votes, as I didn't see any whirly-bird type ventilation fans offered by any RV/Camping Equipment manufacturers anywhere on the web, so it doesn't look like any of the "formally trained" outlets have them. I know they move a lot of air, as they're designed to move hot air out of a house attic, not a 30x8x8 RV shoebox. The ones offered by
Lemanco are the kind I was thinking of, and they offer an 8" version that seems like it would be more than enough.
My 88 Bounder does not move a lot of air even with all three roof vents and the windows wide open. Plus, my idea was more on the lines of the last post by Golden_HVAC for a way to move air out of the RV when its parked, without using any juice. If it spins while we're going down the road, that's a benefit, but it's the STATIONARY movement I'm most interested in. I'll do some more investigation.
BTW, the Lemanco whirlybirds are guaranteed to 110mph winds, so it doesn't seem that 50 or 60mph down the road would be all that outlandish. And they're guaranteed forever... :)
