I have been having a heck of a time with case fans as of late.
I had always heard that there were certain types of fan bearings that were not too fond of being mounted in a horizontal position. I did not think much of it until I began to experience noise with my case fans that had been mounted in the top 120mm duct of my FT02.
Which brings me to the purpose of this thread, what is the best case fan/bearing type for horizontal mounting?
No idea and I'm not sure anyones explored it to any great detail,
have you tried squishing the blade back onto the bearing housing though? sometimes they work loose and that makes a lot of noise, drop of oil or grease too every now and then helps
Sorry I can't be of more help man,