Twenty four volt fans on twelve volts is the way to go. My fans just whisper, not annoying at all.I have had good luck running 24v computer fans at 12v. They move plenty of air and are very quiet.
And there's a bonus. On the surplus or secondary market, 24 Volt fans are cheaper, just because the demand is lower.running 24v computer fans at 12v.
Twenty four volt fans on twelve volts is the way to go. My fans just whisper, not annoying at all.
Turn the volume on your radio up so they can't whisper and be heard.That's what worries me....those whispering fans... what are they saying about me?