Product review (5 stars): Sounds of Silence
I had a Ventline range hood control knob that literally crumbled one morning & had no use of the overhead lighting or the exhaust. I could have simply replaced the control knob but after considering the present hood as antiquated, I decided to update with a new one. I believe I spent more time cleaning up the mess I made when I moved our stove & then the debris that came from the top of the old hood once I removed it. The Broan gives you 3 options as to the type of opening in the range hood as far as size: 7" that comes w/ a 7" adapter plate to cover the 7" & 3 1/4" X 10" knockouts for vertical discharge, a 3 1/4" X 10" knockout for vertical discharge or one to the rear for horizontal discharge w/ a supplied duct transition, or like mine which is a fuddy duddy ole 4" vertical duct which was common, but a 4" adapter IS NOT supplied. Since there wasn't a 4" adapter I DIDN'T remove the 7" knockout as recommended by the instructions. Instead, I positioned the range hood close to the ductwork & outlined the circumference w/ a Sharpie. Took a flat screwdriver & hammer & carefully pierced the knockouts using the screwdriver like a can opener. This allowed me to use my metal shears cutting strips up to the line and then used needle nose pliers to bend the strips upward. With the strips on the inside of the ductwork fitting snug I taped the two together. You can use a bi-metal hole saw instead of a screwdriver to get things started. I'm quite sure that hardware stores or Amazon may have a 4" round adapter simplifying things but I'm use to improvising on the spot. The electrical knockouts are located on the right side top & rear.

The installation is fairly simple since I used quick grip claps to hold the hood in place. The instructions & diagrams are helpful if you need them. You'll need 2 appliance bulbs for lighting & what a world of difference compared to a single bulb. The lighting is excellent & the exhaust to me isn't loud even at top speed. This isn't a fangle dangle high end model but I'm very pleased with it's performance for what I paid.