It ok lor for the price about the same as another CM silent fan...I have four of these and mount in my Centurion 590. The air quite a lot compare to normal silent fan and also silent my rig hardly can be heard after on with ceiling fan on. Planning on getting another 2 of these...Even not @90CFM, it quite satisfying for me....Cheers...

No idea on the CFM but last nite, I resitted my CM 90CFM Fan, and then the cable touch the blade, I 'tolak' the cable and then GANK!, my finger touch the spinning blade and gimme this pain in the nail...



So conclusion here is, it is strong enuff to cut ur finger including ur nail...