I have a Fractal Design Focus G chassis that has two front intake fans. I want to transfer one of the fans to the back of the case as an exhaust fan. But the screws that secure the fans to the front are elongated ones that extend through the fans to some kind of securing bracket behind them. Obviously I can't use those screws at the back of the case as the back has no such bracket. So I'm wondering if it is perfectly healthy for a 120mm fan to screw only one side of it to the four holes at the back of the case? Will this cause problems with rattling in the long run?