Product review (3 stars): quality control issue
Product arrived with two non-shipping related dents that are not an issue with me. The shipping container did not reflect damage where those dents are. However, someone had used a sharpie like pen, marked off the area that would be cut out for ductless operation, and had butchered an opening in it with snips leaving sharp edges. I used the knockout for rear wall venting, (I removed it),  and closed up the area that had been snipped out venting forward to kitchen space. Product comes with a useless plastic piece intended to block such an opening. Once I made this modification, the range hood operates fine.