specificacion fan:
volt: 5V
amp: 0.05A
dimension: 20x20x6mm
one builder: AD2005LB-K70
example ebay: 1pc ADDA Ball Bearing MINI DC fan AD2005LB-K70 5V 0.05A 20x20x6mm #M620 QL | eBay
price: USD 4,50 --- 4,06 EUR
I have bought and installed it and it fits perfectly without having to modify anything.
