Tevo tarantula fan duct 40mm fan

This is the fan duct i'm using now looks like it's working pretty well for me, i decided to print in a high quality just to make him last as long as possible ... maybe i did it wrong... i'm new to 3d printing.
Include a grid to cover the fan on top avoiding any trouble with rotating parts (that was more a waste of time than a good grid you can make it better but if u r lazy it's already set up and may be used as a test printing part.