Keep The Noise Down

Hello all
What i'am after is. ive got 2 small fans from b n q in my tent the thing is what a noise thay make.is there anything that i can do to stop the noise.
Thanks for your help and for looking.

if its a ball bearing fan then you can try tossing in a little oil in there
and try putting rubber washers or something to that affect where the fan mounts