https://www.captiveaire.com/CATALOGC...ON%20CHART.pdf
The hood web page says "max. 65 dB", which is 13.0 sone - not terrible for "High" but a lot higher than 7.0. 1.2 sone is a little hard to believe. Where are you seeing those numbers?
Check that you don't need a downstream fire trap - might be built in to the fan. And of course you will need some sort of through-roof chimney. That's the one part of the upgrade I would probably f* up.
Any use for a wok burner?