Product review (4 stars): Weak at first but after a couple of uses it gets better.
I don't know if it was just takes a while for the power to kick in or what, but after using it for 1 month I can see that when im making steaks or stir fry, the smoke actually gets sucked into the range hood. I still can't say if this is actually 850 CFM, but I have an open kitchen/living room and it keeps the smoke from getting into the living area. For that, it gets the job done.