As for exhausting air....

I have a handy window right by the miners.   I was thinking of a cuff around the fan end of each miner, 6" flex tube about 8-10' long from each miner, to individual vents for each miner - mounted in plywood mounted in the window. 

It would be two right angle turns tho.   Can the miner fans drive exhaust through two turns and 8-10' of tube?'   Or would I be creating too much back pressure?  I have limited(read: none) experience with this kind of stuff so I needed someone with more experience to tell me if this is OK or if I need a "helper" fan at the window/plywood side helping to draw air.

Thanks!

PS: I have a screen in the window and therefore can do without dryer vent type exhaust port.  But the screen might create additional back pressure???