but for the corsair cx600 the fan is up and i saw many people installing it at the bottom left corner of their cabinets. Can i install it in inverted position (i mean the fan facing down) If i install it in the standard position i.e. fan facing up the psu may over heat due to lack of ventilation
Yes, that's the way it was meant to be installed in a top mount case ( didn't somebody already say this ? ).
They tend to be installed upside down in bottom mount cases that aren't vented.
When you see the picture of the psu, and see the big fan, you are looking at the bottom of the powersupply.