The file 'E3DV6 Fixing And Fan Duct Support 3D Printer Model' is (stl) file type, size is 332.1KB.
Based on this thing : https://www.thingiverse.com/thing:1449660
You can place a 30mm fan or a 40mm one with an adaptator. (https://www.thingiverse.com/thing:21112)