ok here is my idea, i think i am going to make a 60mm to 80mm fan adapter. i have a fop38, trying to maybe get a quieter fan. any way what kind of decibal range is the fop38 putting out??? i want to go about 10 less (doesnt it double every 10???) ok so what is the best 80mm high output fan for this job??? sunon, panaflo, delta, anythoughts??? one last question, what if i put a 60mm fan mounted on the side of the heatsink as well, is that going to disrupt the airflow and screw me over more then help???