Product review (3 stars): Functional at low speeds but loud at high speeds. Screws not included.
I was very excited for this product but found that it makes a clicking noise that is definitely not intended at the highest speed. First I thought this was due to uneven installation and reinstalled the product (much more difficult than one would imagine) but it persisted. I then realised that I was missing the dampener that should be included. I have been trying to call the manufacturer ever since to get this remedied.

Also of note is that there are only 4 short screws for the grates included in the package. All other screws needed to actually install the hood onto your walls must be provided yourself.