I have one of those verax fan installed in my cube, cutting the corners is easy, and there is about one mm room left at the top - it´s ok to hear a soft rustle from the fan it is has to be absolutely silent in the room - > They list SIX 80x80x25mm fans. It is not necessary for the fan in the > bottom to be only 15mm deep. 25mm deep also fits as I am sure many on > this list will testify is true. You simply break off the corners on one > side of a 25mm deep 80x80 and it fits perfectly. > > <http://www.verax.de/ > verax.php?SID=d317c332875dcdc6dd9981cf8cd75dce&template=catalog_group&gr > oupid=2>