Kind of hard finding more info on the Iotas adjustablity. One site says there is a small screw for the pot behind a piece of tape/sticker, no case opening needed, and it brings up both ABSV and float voltages. I'll keep looking.
edit:
http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/26613945/srt/pa/pging/1/page/3.cfmLooks like the fan already blows into the case. For some reason I assumed they sucked air out.
Not sure of the Iota's fan max Cfm rating, but I am pretty sure it is 80mm. I just put one of these exhausting my electrical cabinet. Used a provided resistor cable to slow it down and it draws 0.07a
But it not a particularly high speed 80MM fan
http://www.noctua.at/main.php?show=productview&products_id=9&lng=enSuper powerful 80MM fan I have one of these on a gooseneck and a speed controller for internal air movement:
http://www.newegg.com/Product/Product.aspx?Item=N82E16811999612Ridiculously powerful and loud 80mm fan:
http://www.frozencpu.com/products/17269/fan-1083/Delta_80_x_38mm_Extreme_High-Speed_Fan_-_1325_CFM_-_Bare_Wire_PFB0812DHE.html?tl=g36c15s699