Product review (3 stars): Read the Description.  Image is NOT Representative of the Product.
The product image is not the product you are purchasing.  I looked at a lot of hoods before making my purchase and may very well have confused this hood with one of the others I had looked at on Amazon.  I needed a 7" round top exit exhaust, the image appears to be just that.  Had I more carefully read the description instead of looking at the picture I would have seen this is a 3-1/4x10" rectangular top exit.  If I didn't need the hood before Thanksgiving and had time to exchange it before then I would have.  Instead I made the best of the situation, went to the hardware store and purchased the adapters necessary to make this hood work.  This of course required significantly more work to install than had I purchased the proper hood in the first place.

I share the blame with the seller.  I should have paid closer attention to the description, but the seller shouldn't misrepresent the product with the incorrect image in the listing.

The hood itself is nice, approximate 29-7/8" wide, perfect fit in a 30" opening.  Much quieter operation than the 70's model hood it replaced.

Don't forget to install the damper, it comes attached to the underside of the hood.