Product review (3 stars): I've not been able to find another 7" damper anywhere of better quality). The damper rattles and makes much more ...
The hood seems generally well designed and manufactured with care. I'd give it a 5 based on the hood operation EXCEPT it doesn't include a built-in damper. For installation, I purchased a flimsy damper from Home Depot (so far, I've not been able to find another 7" damper anywhere of better quality). The damper rattles and makes much more noise than the fan itself. I was unable to get a useful suggestion from the manufacturer's support email contact.

In my installation, the external exhaust it through the wall about 12" above the hood so there was no possibility of locating the damper remotely. The top of our kitchen cabinets are about 2' below the 10' ceilings so extending the exhaust through the roof is not possible.

Do NOT buy this unit unless you can solve the damper problem. The Broan unit we replaced (for double the air flow at about the same noise level) had a built-in damper which made not identifiable noise. I frankly don't understand why Proline wouldn't include a damper in the unit.

Their installation instructions are a bit confusing as there are details like the electrical connection which have change. Also, they provide one manual for multiple models and the only distinction is to compare the picture of the control panel.  The mounting holes are not uniformly spaced from the edges and no drill template is provided so we had to hold the relatively heavy unit in position to mark the location of pilot holes. Off page references in the manual are wrong or the referenced material is actually missing. None of this was a show stopper but it must made installation more difficult than needed.

Oh, and our unit includes a clock ... a 24Hour only clock ... which displays when the fan or light or on.

2018/1/21: I was able to eliminate 95% of the damper noise by using heat duct tape to secure the damper in the collar which fits between the hood and the duct. Also, I added a small piece of foam weather stripping to the base of each damper 'blade'. About 1" from the bottom. This keeps the two 'blades' from bumping against each other.