I then took the mesh and laid the fan on it marked where to bend it then with a straight edge I bent it being careful to get as tight a bend 90 degrees as I could.

Then I bent the other side the same way.

I put the fan back inside to double check the fit and made adjustments as needed.
Then I measured the sides to bend. I then had to cut two lines for the bend.

But first I cut off the excess mesh always better to cut a little off then to not have enough

In the picture above I cut right on the bend to allow me to bend that piece with out any over hanging piece, both are flat.

Once I cut both sides I bent in both tabs over each other.

Then I bent the other piece over the two pieces I just bent.

Then I bent the tab that will go against the bucket and hold it in place.