OpenSCAD parametric fan model

I took MiseryBot's fixed 60mmx25mm fan model from http://www.thingiverse.com/thing:8063 and made it parametric so I could use it for multiple fan sizes.

Not for building, just for modeling. The STL file is just for Thingiview to work, you want the SCAD file!

I use it in combination with the % operator to help me visualize the end result but not be included in final renderings used for printing.