Just curious to hear what everyones favorite 140mm case fan is? SP and AF. Also what dB does it run @. And can you hear that from outside the case when the case is closed? Im looking to add an extra 140mm fan in the case for more AirFlow. But I don't want it to be too loud. Ive read that 15dB can be heard outside the case. I also read that 25dB cannot be heard from outside the case?