FBL
You asked the right question.
I invented and Lic. the ringcage technology to panasonic.
the FBA is your choice as the panasonic design is louder at the lower statics towards free air due to harmonics with the stuts which dissapates against higher back pressures. I designed that out of the NMB fans so they are quieter by a couple of dBA than the fbl series. NMB only makes 60mm and 90MM, unfortunately.
Regards
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