fan wire polarity?

[Cyber-Mav]

used to standard black and red wire fans so anyone know which would be positive and negative on this fan:

uses black and brown wire.

 

[Cyber-Mav]

Cool will give that a try

 

[Cyber-Mav]

well turns out black was positive

 

[Cyber-Mav]

Im sure a black and decker cordless drill that had nimh or nicad cells in it also had black and brown wire and black was positive. Wired wrong caused the drill to smoke and bust