For use with 30 mm x 10 mm fan housings. There are two landings for surface securing. Since there are many manufacturers of this size fan, the positioning of the fan securing through-holes are approximate and may need reamed to fit a specific model.

The fan is easily secured with 3 mm hardware or even a 3-4 mm diameter wooden skewer.
There are two lands for surface attachment. These will accommodate 3-4 mm hardware. Mounting tape is also appropriate.