FlashForge Creator Pro - reversed fan duct

I tried to print one of this: http://www.thingiverse.com/thing:191297, but it requires a longer screw which I just don't have.
The longest screw sold by nearby hardware store is 35mm, which is the same length as the ones that came with the machine, and they were just too short, I need the extra 5mm...

So I just designed my own!

This duct serves as the spacer, the fan housing, and the fan duct.
I install the duct with the original 35mm screw, then install the fan, and yeah no extra 5mm