Product review (3 stars): Ductless customers, PLAN AHEAD!
Here's the problem: The hood is advertised for ducted or ductless installation. However, when I got it I found I couldn't use it until I purchased a special filter set specifically not provided in the box. The instructions then referred me back to the store where I bought it. ('Like I could just run down to the Amazon store and pick one up.) The old hood was out, the new one in, and I could no longer use my stove. Had I paid much less I would have expected less, but  this lack of consideration for the customer's needs on an otherwise top-of-the-line product is inexcusable. It left a bad taste in my mouth for the Broan company. IF YOU HAVE A DUCTLESS SETUP, DON'T BUY THIS OR AT LEAST ORDER THE FILTER WHEN YOU ORDER THE HOOD!