The apparatus has mounting holes for a 80mm, as described on web page.
But,
I have a tendency to believe it would hinder the CFM of the fan,
and possibly burning the brushes in the motor of the fan itself.
I actually have a similar concept, I have 90mm fan on the side panel of my case (place directly above the HSF unit) with a attachment I made (from Home Depot) that forces air thru a flex tube into my CPU HSF unit that RAISED the rotations of the HSF unit.
I called it my 'dual induction' HSF unit ... hehe.