Why does that "Delta" fan is identical to Nidec VA450DC 
Nidec fan: http://www.nidec.com/en-EU/product/fan/category/F010/G090/P2000430/

Delta ffc series picture http://g02.a.alicdn.com/kf/HTB10EtaIXXXXXXeXXXXq6xXFXXXT/Free-Shipping-Original-Delta-FFC1212DE-S96P-12CM-120mm-12038-DC-12V-2-4A-industrial-server-inverter.jpg