Profile Topics Started Replies Created Engagements Favorites Search replies: Forum Replies Created Viewing 1 post (of 1 total) Author Posts January 31, 2018 at 3:44 pm in reply to: ACC Fan U-bolts #1852 nick_romanoParticipant Is the wet cool type running at the same speed? Do you know the blade natural frequency? The ratio between the BNF and the fan RPM can be tricky and causing troubles. Author Posts Viewing 1 post (of 1 total)