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I have a Panaflo FBA12G12U (.65A, 2950RPM, 119CFM) that has been going at 85% of full speed or higher for over a year and hasn't given any indication of having a problem.
Cut to last fall. I got two Ultra Kaze's because, hey, they're cheap. Would have been much better served getting ONE additional Panaflo. Not one, but both Kaze's have started making a horrible clicking noise. Except for benching sessions, they didn't run more than 80% of full speed and less than two months each. Won't ever make that mistake again.
Any high speed performance fans I get in the future will all be Panaflo. Scythe may make other good fans, but I'll never know because of my experience with their Ultra junk.