Product review (5 stars): Slim profile yet powerful
I was looking to replace our over the head microwave/hood combo - which was loud and inefficient sucking the air out (maybe 250-300 CFM max) - for a more powerful range hood in the 900 CFM but most in this range are in the 9-10" thick and would restrict the cooking space. Found and bought this gem with just 7" profile, not the slimmest but definitely among the most powerful out there.  I was concerned about the noise loudness due to reviews on other similar systems so besides the mfr. specification, I double checked and noticed that this particular one has an 8" duct venting as compared to 6" for the other ones and by physics, the larger vent duct should allow more air flow and less noise.

The width of the hood itself is 29-5/8" so you definitely need a 30" clearance side-to-side to slide it in.  It fits the under cabinet space like a glove even though ours is quite small with just about 10-1/2" D x 28-3/4" W opening (under).  I personally think that the provided fasteners (screws/bolts) are on the thin side so I replaced those with 1 size thicker and stronger hardware just in case.  Self-installation was not simple but doable b/c it's made of heavy stainless steel and weighs in the 40-45 lbs so would require two persons (tips: we put it on a pneumatic office chair which sat on a piece of plywood on top of the range to help lift it up in place).  The notice was clear but we installed the wood strips or stringers (10" x 1-1/2" x 1/2") on both sides and in the back as well for better support.

IMPORTANT TIPS:
- Make sure to install the stringers slightly above the bottom cabinet frame at about 1/8"-3/16" so that the mounting brackets can pull the hood all the way up to flush with the bottom cabinet.

- Also when the unit is still on the floor, make sure to set the (4) bolts (that will hold the brackets at the 4 corners) thru the top cover, then add washers and nuts (just a few turns) to hold the bolts in place.  I didn't think about it and it was a pain to get the bolts up thru the tiny holes from underneath with very little clearance and visibility.

It looks beautiful once in place.  I then downloaded a (free) sound meter app on my iphone and measured the noise levels from 3ft away at three different speeds and got 60dB @ 300 CFM, 64dB @ 600 CFM and 68dB @ 900 CFM - which are not noisy and bothering at all compared to our old one (probably 75-80dB @ 300 CFM as nobody can hear nobody when it was on).  I believed that it could be even quieter if we'd enlarge our venting duct from 7" to 8" but not worth the effort for our needs.

Would definitely recommend it.