Wanhao Duplicator i3 V2 Blower Fan Adaptor

Wanhao i3 blower fan adapter (Fits: Delta BFB1012H Blower Fan) (you can use the two bolts from the original 30x30 fan) fits 12v blowers with an outlet in the range of 58mm x 32mm (commonly used as CPU coolers in computers), It works great and at 50% the fan noise is virtually non-existent whilst providing a very strong current of air through the existing part-cooling assembly.

Edit: If you intend on using the same spec fan I as have in the picture remember to slice your models with the fan