I just installed the new fans in a reverse fashion... so air now is sucked through the rear grate and exhausted through the side where the power and ethernet connections are.  Again; for my application, this is a much better design but I wanted to mention that it wasn't a problem; however, to prevent the fans power cable from being sucked into the fan, I routed it from the bottom section of the fan to the power lead.  The power wire is usually coming from the upper left of the cube (as you face it level), this had to change to make the wire shorter and more direct to prevent the wire from stopping the fan, or getting damaged.  There has been no impact to the cube's performance by making this alteration.