Hello, I am a french newbie on that forum. Excuse my poor english ! The question is in the title. There are 3 120 mm fans NMB 4710NL-04W-B30 inside on the rear and one little fan (?) on the front. NMB characteristics : 12 V 80 CFM (=140 m3/h) pression 0.12 2050 rpm 35 dBA Papst fans with similar characteristics don't seem to be more silent than the original ones. I know that at Henry's website http://www.crtprojectors.co.uk/ they make modifications to make Barco be more silent but I don't know what it consist of. Thank you for your help.