Blower Fan Mount

I absolutely love the design for the E3Dv6 fan ducts by Venture3D (http://www.thingiverse.com/thing:1213670), but I found that I wasn't getting enough airflow with the 40mm or the 30mm fan duct. My problem is, the way I have my setup built, I can't use both sides. One side is blocked by my sensor mount (and extruder wires). So I decided to make this to install a blower fan with the circular duct (http://www.thingiverse.com/thing:1620630).

The mounting hole is elongated in order to adjust the