We installed the PM250 in a custom hood about 6 months ago. It's worked well, no major complaints, except that it came without a light bulb or the recirculation filter. Install was fine... custom installs always take some work. On low it's not particularly quiet, on high it is moderately loud. Not as loud as many of the over stove microwave fans I've experienced, but loud enough that you need to raise your voice when at the stove.