I bought this item as 750 CFM!! Its the only item I bought from Wayfair so I never logged in there. Now I logged in to buy something else and when I checked My Orders (after few months), I found that the description of this item has changed to 400 CFM!!!!
This is the worst buy of my entire renovation project. It doesnt take out the smoke well  its very noisy  It make strange noise when it starts for 2 seconds and then fades away  worst of all, they sent me lower CFM and Im not sure what to do now.. probably Ill try to contact Wayfair admins after writing this review.
VERY UNSATISFIED!!