Product review (2 stars): Centered round top vent only, poor quality control
Purchased this range hood after doing quite a bit of research. The purported CFM ratings (approx. 750) and twin fans looked very good on paper. Upon receipt of the range hood, I discovered that there was no standard rectangular 3" x 10" exhaust cutout on the top (which is required in many, if not most, retrofit range hood applications).  Instead, there was only a centered circular 6" cut-out. Also, there was no rear electrical knock-out (only one on top).  No standard holes in the top for under-cabinet screw mounting either.  This was enough to dissuade me from attempting to install this unit (which would otherwise have involved a difficult and lengthy installation).  The nail in the coffin was the poor quality control of this unit throughout, which had the overall appearance of a Chinese-made product of 20 years ago. One fan rubbed in its housing. Both fans had cheap uncentered black plastic caps covering bolts that wobbled when the fans revolved. One interior junction box was closed improperly. Both fan housings had loose screws.  I did not want to risk installing this unit and finding more things wrong. Instead, I would up buying a Whirlpool 350 CFM range hood at Home Depot, which had all the right cut-outs and no problems I have detected yet. I spent 45 minutes installing the Whirlpool unit (not the several hours the Kaze would have required).