hey guys i recently removed my stock h100i fans because they sounded like jet engines and replaced them with sp120, the sound levels are really quite now but the temps seem to be up and down. it was the first time installing the sp120 fans into a pc and i think i have managed to do everything correct. the fans are both spinning ontop of the radiator fine. the arrow signs on the fans if i remember was "down, horizontal" this worried me because i am now thinking the fans are not doing there job properly blowing air inside the pc rather then out and now im thinking i have installed them wrong.