How to model fan conver in Inventor?

Have a look at http://grabcad.com/library/fan-grill--1

This is a generated by drawing a surface onto which a number of 3D curves are projected. A circular profile is then swept along each curve.

Its rough and ready but gives a possible solution

"...revolve it"
It is solution for wires modeling like fishnet. Please, look at http://s11.postimage.org/xbv6khy03/Untitled.jpg

and

http://irecommend.ru/sites/default/files/product-images/25544/vitek_breeze.jpg

There is a easy way and a hard way to do everything, I think you are just over thinking how to make this model....

Make one wire part and then just revolve it.
:P