Foghash c2 hole drilling questions

I have all the components needed to install the fog hash c2 accept the actual miners and electrical work. How high off the ground are the holes drilled on the walls, and how far apart does the intake and outtake lines need to be? The dry cooler will be on top of 2 4x4s.

Also my dry cooler will not be very far apart from the unit. Is it ok to coil the extra hose length?