I'm guessing that "FF" means "Fantastic Fan," as in the bathroom vent fan.
I just blew $75 ($65 + $10 S&H) on a 12 inch 12 volt fan from CW that claims to move 900 cubic feet of air a minute in comparison to our Fantastic Vortex bathroom vent fan, which moves a whopping 188 cubic feet of air a minute, both for the same 3 amp draw.
Says here it puts out a 10 mph breeze.
I ordered it because two weeks ago we camped at a campground we love, but at which there is no electricity. There was also no breeze whatever, and thus no air movement through the camper. We did spend the night naked on top of the covers. It got mighty flippin' hot!
I don't yet have that fan, so we haven't had a chance to test it out. But I'm thinking that the 12 volt receptacle on our TV shelf is close enough to the window next to the bed, . . . .