surge, the Panaflo's will also make quite an annoying bearing noise if you're really silence focused.
If you're willing to take a punt, I'll try to source some of the 12cm Tricod (Nexus-alike) fans here and send them over and let you try them out. At 10-11v they'd push as much air as the Panaflo L1A's at 8v, and do it without anywhere near as much noise. I'd only ask for the cost of the two fans + postage, which would be around £11 all up.
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