Good luck... And I have the same fan but at 190 CFM and it is about 3 times louder then a 6990... Mine run at around 55 dBa and 6990s are like 34 maxed out I'm prity sure (dBa is an exponential scale)... If u are in the same room as ur rig for extended periods, they can possibly cause damage to hearing... Sry if this makes it harder to sell, buy buyers should know this info... Anyways, good luck