Happy New Year All.

Despite living in a cold room here in England my anminer is insistent of mostly spinning the fans at 1680rpm. Temps are fine, 40/38 never higher. Frequency is kept stock at 225 but the noise is so loud from the fans. Is there a way to spin them down to perhaps 1260ish - it seems possible as they perhaps do this maybe briefly one an hour. I thought about maybe underclocking the unit? Played around in the terminal but couldnt find and fan settings etc.

Any bright ideas?